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PAGE類型三方程及不等式1.(2023·內(nèi)蒙古赤峰·統(tǒng)考中考真題)用配方法解方程SKIPIF1<0時,配方后正確的是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【分析】根據(jù)配方法,先將常數(shù)項移到右邊,然后兩邊同時加上SKIPIF1<0,即可求解.【詳解】解:SKIPIF1<0移項得,SKIPIF1<0兩邊同時加上SKIPIF1<0,即SKIPIF1<0∴SKIPIF1<0,故選:C.【點睛】本題考查了配方法解一元二次方程,熟練掌握配方法是解題的關(guān)鍵.2.(2023·湖南·統(tǒng)考中考真題)將關(guān)于x的分式方程SKIPIF1<0去分母可得(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【分析】方程兩邊都乘以SKIPIF1<0,從而可得答案.【詳解】解:∵SKIPIF1<0,去分母得:SKIPIF1<0,整理得:SKIPIF1<0,故選:A.【點睛】本題考查的是分式方程的解法,熟練的把分式方程化為整式方程是解本題的關(guān)鍵.3.(2023·甘肅武威·統(tǒng)考中考真題)方程SKIPIF1<0的解為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【分析】把分式方程轉(zhuǎn)化為整式方程求解,然后解出的解要進行檢驗,看是否為增根.【詳解】去分母得SKIPIF1<0,解方程得SKIPIF1<0,檢驗:SKIPIF1<0是原方程的解,故選:A.【點睛】本題考查了解分式方程的一般步驟,解題關(guān)鍵是熟記解分式方程的基本思想是“轉(zhuǎn)化思想”,即把分式方程轉(zhuǎn)化為整式方程求解,注意分式方程需要驗根.4.解方程SKIPIF1<0,以下去括號正確的是()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【分析】去括號得法則:括號前面是正因數(shù),去掉括號和正號,括號里的每一項都不變號;括號前面是負因數(shù),去掉括號和負號,括號里的每一項都變號.【詳解】解:SKIPIF1<0SKIPIF1<0,故選:D.【點睛】此題主要考查了解一元一次方程,其步驟為:去分母,去括號,移項合并,把未知數(shù)系數(shù)化為1,求出解.去括號注意幾點:①不要漏乘括號里的每一項;②括號前面是負因數(shù),去掉括號和負號,括號里的每一項一定都變號.5.(2023·上?!そy(tǒng)考中考真題)在分式方程SKIPIF1<0中,設(shè)SKIPIF1<0,可得到關(guān)于y的整式方程為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【分析】設(shè)SKIPIF1<0,則原方程可變形為SKIPIF1<0,再化為整式方程即可得出答案.【詳解】解:設(shè)SKIPIF1<0,則原方程可變形為SKIPIF1<0,即SKIPIF1<0;故選:D.【點睛】本題考查了利用換元法解方程,正確變形是關(guān)鍵,注意最后要化為整式方程.6.(2023·遼寧大連·統(tǒng)考中考真題)將方程SKIPIF1<0去分母,兩邊同乘SKIPIF1<0后的式子為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【分析】根據(jù)解分式方程的去分母的方法即可得.【詳解】解:SKIPIF1<0,兩邊同乘SKIPIF1<0去分母,得SKIPIF1<0,故選:B.【點睛】本題考查了解分式方程,熟練掌握去分母的方法是解題關(guān)鍵.7.(2023·四川眉山·統(tǒng)考中考真題)已知關(guān)于SKIPIF1<0的二元一次方程組SKIPIF1<0的解滿足SKIPIF1<0,則m的值為(
)A.0 B.1 C.2 D.3【答案】B【分析】將方程組的兩個方程相減,可得到SKIPIF1<0,代入SKIPIF1<0,即可解答.【詳解】解:SKIPIF1<0,SKIPIF1<0得SKIPIF1<0,SKIPIF1<0,代入SKIPIF1<0,可得SKIPIF1<0,解得SKIPIF1<0,故選:B.【點睛】本題考查了根據(jù)解的情況求參數(shù),熟練利用加減法整理代入是解題的關(guān)鍵.8.方程組SKIPIF1<0的解是()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【分析】直接利用加減消元法解該二元一次方程組即可.【詳解】SKIPIF1<0,②-①得:SKIPIF1<0,即SKIPIF1<0,∴SKIPIF1<0.將SKIPIF1<0代入①得:SKIPIF1<0,∴SKIPIF1<0.故原二元一次方程組的解為SKIPIF1<0.故選B.【點睛】本題考查解二元一次方程組.掌握解二元一次方程組的方法和步驟是解答本題的關(guān)鍵.9.(2023·四川南充·統(tǒng)考中考真題)關(guān)于x,y的方程組SKIPIF1<0的解滿足SKIPIF1<0,則SKIPIF1<0的值是(
)A.1 B.2 C.4 D.8【答案】D【分析】法一:利用加減法解方程組,用SKIPIF1<0表示出SKIPIF1<0,再將求得的代數(shù)式代入SKIPIF1<0,得到SKIPIF1<0的關(guān)系,最后將SKIPIF1<0變形,即可解答.法二:SKIPIF1<0中SKIPIF1<0得到SKIPIF1<0,再根據(jù)SKIPIF1<0求出SKIPIF1<0代入代數(shù)式進行求解即可.【詳解】解:法一:SKIPIF1<0,SKIPIF1<0得SKIPIF1<0,解得SKIPIF1<0,將SKIPIF1<0代入SKIPIF1<0,解得SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,得到SKIPIF1<0,SKIPIF1<0,法二:SKIPIF1<0SKIPIF1<0得:SKIPIF1<0,即:SKIPIF1<0,∵SKIPIF1<0,∴SKIPIF1<0,SKIPIF1<0,故選:D.【點睛】本題考查了根據(jù)二元一次方程解的情況求參數(shù),同底數(shù)冪除法,冪的乘方,熟練求出SKIPIF1<0的關(guān)系是解題的關(guān)鍵.10.對于二元一次方程組SKIPIF1<0,將①式代入②式,消去SKIPIF1<0可以得到(
)A.SKIPIF1<0B.SKIPIF1<0C.SKIPIF1<0D.SKIPIF1<0【答案】B【分析】將①式代入②式消去去括號即可求得結(jié)果.【詳解】解:將①式代入②式得,SKIPIF1<0,故選B.【點睛】本題考查了代入消元法求解二元一次方程組,熟練掌握代入消元法是解題的關(guān)鍵.11.用加減消元法解二元一次方程組x+3y=4,①2x?y=1?②A.①×2﹣② B.②×(﹣3)﹣① C.①×(﹣2)+② D.①﹣②×3【分析】方程組利用加減消元法變形即可.【解析】A、①×2﹣②可以消元x,不符合題意;B、②×(﹣3)﹣①可以消元y,不符合題意;C、①×(﹣2)+②可以消元x,不符合題意;D、①﹣②×3無法消元,符合題意.故選:D.12.關(guān)于x的方程SKIPIF1<0的解是正數(shù),則a的取值范圍是()A.a(chǎn)>-1B.a(chǎn)>-1且a≠0C.a(chǎn)<-1D.a(chǎn)<-1且a≠-2【答案】D【分析】將分式方程變?yōu)檎椒匠糖蟪鼋猓俑鶕?jù)解為正數(shù)且不能為增根,得出答案.【詳解】方程左右兩端同乘以最小公分母x-1,得2x+a=x-1.解得:x=-a-1且x為正數(shù).所以-a-1>0,解得a<-1,且a≠-2.(因為當(dāng)a=-2時,方程不成立.)【點睛】本題難度中等,易錯點:容易漏掉了a≠-2這個信息.13.若關(guān)于x的方程SKIPIF1<0無解,則m的值為(
)A.0 B.4或6 C.6 D.0或4【答案】D【分析】現(xiàn)將分時方程化為整式方程,再根據(jù)方程無解的情況分類討論,當(dāng)SKIPIF1<0時,當(dāng)SKIPIF1<0時,SKIPIF1<0或SKIPIF1<0,進行計算即可.【詳解】方程兩邊同乘SKIPIF1<0,得SKIPIF1<0,整理得SKIPIF1<0,SKIPIF1<0原方程無解,SKIPIF1<0當(dāng)SKIPIF1<0時,SKIPIF1<0;當(dāng)SKIPIF1<0時,SKIPIF1<0或SKIPIF1<0,此時,SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<0,當(dāng)SKIPIF1<0時,SKIPIF1<0無解;當(dāng)SKIPIF1<0時,SKIPIF1<0,解得SKIPIF1<0;綜上,m的值為0或4;故選:D.【點睛】本題考查了分式方程無解的情況,即分式方程有增根,分兩種情況,分別是最簡公分母為0和化成的整式方程無解,熟練掌握知識點是解題的關(guān)鍵.14.分式方程SKIPIF1<0的解為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【分析】直接通分運算后,再去分母,將分式方程化為整式方程求解.【詳解】解:SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,解得:SKIPIF1<0,檢驗:當(dāng)SKIPIF1<0時,SKIPIF1<0,SKIPIF1<0是分式方程的解,故選:A.【點睛】本題考查了解分式方程,解題的關(guān)鍵是:去分母化為整式方程求解,最后需要對解進行檢驗.15.(2023·河南·統(tǒng)考中考真題)關(guān)于x的一元二次方程SKIPIF1<0的根的情況是(
)A.有兩個不相等的實數(shù)根 B.有兩個相等的實數(shù)根C.只有一個實數(shù)根 D.沒有實數(shù)根【答案】A【分析】對于SKIPIF1<0,當(dāng)SKIPIF1<0,方程有兩個不相等的實根,當(dāng)SKIPIF1<0,方程有兩個相等的實根,SKIPIF1<0,方程沒有實根,根據(jù)原理作答即可.【詳解】解:∵SKIPIF1<0,∴SKIPIF1<0,所以原方程有兩個不相等的實數(shù)根,故選:A.【點睛】本題考查了一元二次方程根的判別式,熟練掌握一元二次方程根的判別式是解題關(guān)鍵.16.(2023·四川眉山·統(tǒng)考中考真題)關(guān)于x的一元二次方程SKIPIF1<0有兩個不相等的實數(shù)根,則m的取值范圍是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【分析】利用一元二次方程根的判別式求解即可.【詳解】解:∵關(guān)于x的一元二次方程SKIPIF1<0有兩個不相等的實數(shù)根,∴SKIPIF1<0,∴SKIPIF1<0,故選:D.【點睛】本題主要考查了一元二次方程根的判別式,對于一元二次方程SKIPIF1<0,若SKIPIF1<0,則方程有兩個不相等的實數(shù)根,若SKIPIF1<0,則方程有兩個相等的實數(shù)根,若SKIPIF1<0,則方程沒有實數(shù)根.17.(2023·新疆·統(tǒng)考中考真題)用配方法解一元二次方程SKIPIF1<0,配方后得到的方程是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【分析】方程兩邊同時加上一次項系數(shù)一半的平方即SKIPIF1<0計算即可.【詳解】∵SKIPIF1<0,∴SKIPIF1<0,∴SKIPIF1<0,∴SKIPIF1<0,故選:D.【點睛】本題考查了配方法,熟練掌握配方法的基本步驟是解題的關(guān)鍵.18.(2023·四川樂山·統(tǒng)考中考真題)若關(guān)于x的一元二次方程SKIPIF1<0兩根為SKIPIF1<0,且SKIPIF1<0,則m的值為(
)A.4 B.8 C.12 D.16【答案】C【分析】根據(jù)一元二次方程根與系數(shù)的關(guān)系得出SKIPIF1<0,然后即可確定兩個根,再由根與系數(shù)的關(guān)系求解即可.【詳解】解:∵關(guān)于x的一元二次方程SKIPIF1<0兩根為SKIPIF1<0,∴SKIPIF1<0,∵SKIPIF1<0,∴SKIPIF1<0,∴SKIPIF1<0,故選:C.【點睛】題目主要考查一元二次方程根與系數(shù)的關(guān)系,熟練掌握此關(guān)系是解題關(guān)鍵.19.(2023·山東濱州·統(tǒng)考中考真題)一元二次方程SKIPIF1<0根的情況為()A.有兩個不相等的實數(shù)根B.有兩個相等的實數(shù)根C.沒有實數(shù)根 D.不能判定【答案】A【分析】根據(jù)題意,求得SKIPIF1<0,根據(jù)一元二次方程根的判別式的意義,即可求解.【詳解】解:∵一元二次方程SKIPIF1<0中,SKIPIF1<0,∴SKIPIF1<0,∴一元二次方程SKIPIF1<0有兩個不相等的實數(shù)根,故選:A.【點睛】本題考查了一元二次方程的根的判別式的意義,熟練掌握一元二次方程根的判別式的意義是解題的關(guān)鍵.20.(2023·全國·統(tǒng)考中考真題)一元二次方程SKIPIF1<0根的判別式的值是(
)A.33 B.23 C.17 D.SKIPIF1<0【答案】C【分析】直接利用一元二次方程根的判別式SKIPIF1<0求出答案.【詳解】解:∵SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,∴SKIPIF1<0.故選:C.【點睛】此題主要考查了一元二次方程的根的判別式,正確記憶公式是解題關(guān)鍵.21.(2023·四川·統(tǒng)考中考真題)關(guān)于x的一元二次方程SKIPIF1<0根的情況,下列說法中正確的是()A.有兩個不相等的實數(shù)根 B.有兩個相等的實數(shù)根C.沒有實數(shù)根 D.無法確定【答案】C【分析】直接利用一元二次方程根的判別式即可得.【詳解】解:SKIPIF1<0,其中SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,∴SKIPIF1<0,∴方程沒有實數(shù)根.故選:C.【點睛】本題主要考查了一元二次方程根的判別式,對于一元二次方程SKIPIF1<0,若SKIPIF1<0,則方程有兩個不相等的實數(shù)根,若SKIPIF1<0,則方程有兩個相等的實數(shù)根,若SKIPIF1<0,則方程沒有實數(shù)根.22.(2023·山東聊城·統(tǒng)考中考真題)若一元二次方程SKIPIF1<0有實數(shù)解,則m的取值范圍是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0且SKIPIF1<0 D.SKIPIF1<0且SKIPIF1<0【答案】D【分析】由于關(guān)于SKIPIF1<0的一元二次方程SKIPIF1<0有實數(shù)根,根據(jù)一元二次方程根與系數(shù)的關(guān)系可知SKIPIF1<0,且SKIPIF1<0,據(jù)此列不等式求解即可.【詳解】解:由題意得,SKIPIF1<0,且SKIPIF1<0,解得,SKIPIF1<0,且SKIPIF1<0.故選:D.【點睛】本題考查了一元二次方程SKIPIF1<0的根的判別式SKIPIF1<0與根的關(guān)系,熟練掌握根的判別式與根的關(guān)系式解答本題的關(guān)鍵.當(dāng)SKIPIF1<0時,一元二次方程有兩個不相等的實數(shù)根;當(dāng)SKIPIF1<0時,一元二次方程有兩個相等的實數(shù)根;當(dāng)SKIPIF1<0時,一元二次方程沒有實數(shù)根.23.分式方程SKIPIF1<0的解是()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【分析】先去分母,然后再進行求解方程即可.【詳解】解:SKIPIF1<0SKIPIF1<0,∴SKIPIF1<0,經(jīng)檢驗:SKIPIF1<0是原方程的解;故選D.【點睛】本題主要考查分式方程的解法,熟練掌握分式方程的解法是解題的關(guān)鍵.24.(2023·四川瀘州·統(tǒng)考中考真題)關(guān)于SKIPIF1<0的一元二次方程SKIPIF1<0的根的情況是()A.沒有實數(shù)根 B.有兩個相等的實數(shù)根C.有兩個不相等的實數(shù)根 D.實數(shù)根的個數(shù)與實數(shù)SKIPIF1<0的取值有關(guān)【答案】C【分析】根據(jù)一元二次方程根的判別式求出SKIPIF1<0,即可得出答案.【詳解】解:∵SKIPIF1<0,∴關(guān)于SKIPIF1<0的一元二次方程SKIPIF1<0有兩個不相等的實數(shù)根,故C正確.故選:C.【點睛】本題考查了根的判別式,一元二次方程SKIPIF1<0的根與SKIPIF1<0有如下關(guān)系:當(dāng)SKIPIF1<0時,方程有兩個不相等的實數(shù)根;當(dāng)SKIPIF1<0時,方程有兩個相等的實數(shù)根;當(dāng)SKIPIF1<0時,方程無實數(shù)根.25.(2023·天津·統(tǒng)考中考真題)若SKIPIF1<0是方程SKIPIF1<0的兩個根,則(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【分析】根據(jù)一元二次方程的根與系數(shù)的關(guān)系即可得.【詳解】解:方程SKIPIF1<0中的SKIPIF1<0,SKIPIF1<0是方程SKIPIF1<0的兩個根,SKIPIF1<0,SKIPIF1<0,故選:A.【點睛】本題考查了一元二次方程的根與系數(shù)的關(guān)系,熟練掌握一元二次方程的根與系數(shù)的關(guān)系是解題關(guān)鍵.26.(2023·湖南常德·統(tǒng)考中考真題)不等式組SKIPIF1<0的解集是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【分析】分別求出各不等式的解集,再求出其公共解集即可.【詳解】SKIPIF1<0解不等式①,移項,合并同類項得,SKIPIF1<0;解不等式②,移項,合并同類項得,SKIPIF1<0故不等式組的解集為:SKIPIF1<0.故選:C.【點睛】本題考查的是解一元一次不等式組,熟知“同大取大;同小取?。淮笮⌒〈笾虚g找;大大小小找不到”的原則是解答此題的關(guān)鍵.27.(2023·湖北·統(tǒng)考中考真題)不等式組SKIPIF1<0的解集是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【分析】先求出每個不等式的解集,再根據(jù)“同大取大,同小取小,大小小大中間找,大大小小找不到(無解)”求出不等式組的解集.【詳解】解:SKIPIF1<0解不等式①得:SKIPIF1<0,解不等式②得:SKIPIF1<0,∴不等式組的解集為SKIPIF1<0,故選:A.【點睛】本題主要考查了解一元一次不等式組,正確求出每個不等式的解集是解題的關(guān)鍵.28.(2023·廣東·統(tǒng)考中考真題)一元一次不等式組SKIPIF1<0的解集為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【分析】第一個不等式解與第二個不等式的解,取公共部分即可.【詳解】解:SKIPIF1<0解不等式SKIPIF1<0得:SKIPIF1<0結(jié)合SKIPIF1<0得:不等式組的解集是SKIPIF1<0,故選:D.【點睛】本題考查解一元一次不等式組,掌握解一元一次不等式組的一般步驟是解題的關(guān)鍵.29.(2023·四川眉山·統(tǒng)考中考真題)關(guān)于x的不等式組SKIPIF1<0的整數(shù)解僅有4個,則m的取值范圍是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【分析】不等式組整理后,表示出不等式組的解集,根據(jù)整數(shù)解共有4個,確定出m的范圍即可.【詳解】解:SKIPIF1<0,由②得:SKIPIF1<0,解集為SKIPIF1<0,由不等式組的整數(shù)解只有4個,得到整數(shù)解為2,1,0,SKIPIF1<0,∴SKIPIF1<0,∴SKIPIF1<0;故選:A.【點睛】本題主要考查解一元一次不等式組,一元一次不等式組的整數(shù)解等知識點的理解和掌握,能根據(jù)不等式組的解集得到SKIPIF1<0是解此題的關(guān)鍵.30.(2023·四川遂寧·統(tǒng)考中考真題)若關(guān)于x的不等式組SKIPIF1<0的解集為SKIPIF1<0,則a的取值范圍是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【分析】分別求出各不等式的解集,再根據(jù)不等式組的解集是SKIPIF1<0求出a的取值范圍即可.【詳解】解:SKIPIF1<0解不等式①得:SKIPIF1<0,解不等式②得:SKIPIF1<0,∵關(guān)于SKIPIF1<0的不等式組SKIPIF1<0的解集為SKIPIF1<0,∴SKIPIF1<0,故選:D.【點睛】本題考查的是解一元一次不等式組,熟知“同大取大;同小取?。淮笮⌒〈笾虚g找;大大小小找不到”的原則是解答此題的關(guān)鍵.31.(2023·內(nèi)蒙古通遼·統(tǒng)考中考真題)點Q的橫坐標為一元一次方程SKIPIF1<0的解,縱坐標為SKIPIF1<0的值,其中a,b滿足二元一次方程組SKIPIF1<0,則點Q關(guān)于y軸對稱點SKIPIF1<0的坐標為___________.【答案】SKIPIF1<0【分析】先分別解一元一次方程SKIPIF1<0和二元一次方程組SKIPIF1<0,求得點Q的坐標,再根據(jù)直角坐標系中點的坐標的規(guī)律即可求解.【詳解】解:SKIPIF1<0,移項合并同類項得,SKIPIF1<0,系數(shù)化為1得,SKIPIF1<0,∴點Q的橫坐標為5,∵SKIPIF1<0,由SKIPIF1<0得,SKIPIF1<0,解得:SKIPIF1<0,把SKIPIF1<0代入①得,SKIPIF1<0,解得:SKIPIF1<0,∴SKIPIF1<0,∴點Q的縱坐標為SKIPIF1<0,∴點Q的坐標為SKIPIF1<0,又∴點Q關(guān)于y軸對稱點SKIPIF1<0的坐標為SKIPIF1<0,故答案為:SKIPIF1<0.【點睛】本題考查解一元一次方程和解二元一次方程組、代數(shù)值求值、直角坐標系中點的坐標的規(guī)律,熟練掌握解一元一次方程和解二元一次方程組的方法求得點Q的坐標是解題的關(guān)鍵.32.已知二元一次方程組SKIPIF1<0,則SKIPIF1<0的值為______.【答案】1【分析】直接由②-①即可得出答案.【詳解】原方程組為SKIPIF1<0,由②-①得SKIPIF1<0.故答案為:1.【點睛】本題考查二元一次方程組的特殊解法,解題的關(guān)鍵是學(xué)會觀察,并用整體法求解.33.(2023·四川達州·統(tǒng)考中考真題)已知SKIPIF1<0是方程SKIPIF1<0的兩個實數(shù)根,且SKIPIF1<0,則SKIPIF1<0的值為___________.【答案】7【分析】根據(jù)根與系數(shù)的關(guān)系求出SKIPIF1<0與SKIPIF1<0的值,然后整體代入求值即可.【詳解】∵SKIPIF1<0是方程SKIPIF1<0的兩個實數(shù)根,∴SKIPIF1<0,SKIPIF1<0,∵SKIPIF1<0,∴SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,∴解得SKIPIF1<0.故答案為:7.【點睛】本題考查一元二次方程根與系數(shù)的關(guān)系,代數(shù)式求值.熟記一元二次方程根與系數(shù)的關(guān)系:SKIPIF1<0和SKIPIF1<0是解題關(guān)鍵.34.若SKIPIF1<0、SKIPIF1<0滿足SKIPIF1<0,則代數(shù)式SKIPIF1<0的值為______.【答案】-6【分析】根據(jù)方程組中x+2y和x-2y的值,將代數(shù)式利用平方差公式分解,再代入計算即可.【詳解】解:∵x-2y=-2,x+2y=3,∴x2-4y2=(x+2y)(x-2y)=3×(-2)=-6,故答案為:-6.【點睛】本題主要考查方程組的解及代數(shù)式的求值,觀察待求代數(shù)式的特點與方程組中兩方程的聯(lián)系是解題關(guān)鍵.35.已知關(guān)于x,y的二元一次方程組SKIPIF1<0滿足SKIPIF1<0,則a的取值范圍是____.【答案】SKIPIF1<0.【分析】根據(jù)題目中方程組的的特點,將兩個方程作差,即可用含a的代數(shù)式表示出SKIPIF1<0,再根據(jù)SKIPIF1<0,即可求得SKIPIF1<0的取值范圍,本題得以解決.【詳解】解:SKIPIF1<0①-②,得SKIPIF1<0∵SKIPIF1<0∴SKIPIF1<0,解得SKIPIF1<0,故答案為:SKIPIF1<0.【點睛】本題考查解一元一次不等式,二元一次方程組的解,熟悉相關(guān)性質(zhì)是解答本題的關(guān)鍵.36.(2023·浙江紹興·統(tǒng)考中考真題)方程SKIPIF1<0的解是________.【答案】SKIPIF1<0【分析】先去分母,左右兩邊同時乘以SKIPIF1<0,再根據(jù)解一元一次方程的方法和步驟進行解答,最后進行檢驗即可.【詳解】解:去分母,得:SKIPIF1<0,化系數(shù)為1,得:SKIPIF1<0.檢驗:當(dāng)SKIPIF1<0時,SKIPIF1<0,∴SKIPIF1<0是原分式方程的解.故答案為:SKIPIF1<0.【點睛】本題主要考查了解分式方程,解題的關(guān)鍵是掌握解分式方程的方法和步驟,正確找出最簡公分母,注意解分式方程要進行檢驗.37.若方程SKIPIF1<0的解使關(guān)于SKIPIF1<0的不等式SKIPIF1<0成立,則實數(shù)SKIPIF1<0的取值范圍是________.【答案】SKIPIF1<0【分析】先解分式方程得SKIPIF1<0,再把SKIPIF1<0代入不等式計算即可.【詳解】SKIPIF1<0去分母得:SKIPIF1<0解得:SKIPIF1<0經(jīng)檢驗,SKIPIF1<0是分式方程的解把SKIPIF1<0代入不等式SKIPIF1<0得:SKIPIF1<0解得SKIPIF1<0故答案為:SKIPIF1<0【點睛】本題綜合考查分式方程的解法和一元一次不等式的解法,解題的關(guān)鍵是熟記相關(guān)運算法則.38.(2023·江蘇蘇州·統(tǒng)考中考真題)分式方程SKIPIF1<0的解為SKIPIF1<0________________.【答案】SKIPIF1<0【分析】方程兩邊同時乘以SKIPIF1<0,化為整式方程,解方程驗根即可求解.【詳解】解:方程兩邊同時乘以SKIPIF1<0,SKIPIF1<0解得:SKIPIF1<0,經(jīng)檢驗,SKIPIF1<0是原方程的解,故答案為:SKIPIF1<0.【點睛】本題考查了解分式方程,熟練掌握解分式方程的步驟是解題的關(guān)鍵.39.(2023·湖南永州·統(tǒng)考中考真題)若關(guān)于x的分式方程SKIPIF1<0(m為常數(shù))有增根,則增根是_______.【答案】SKIPIF1<0【分析】根據(jù)使分式的分母為零的未知數(shù)的值,是方程的增根,計算即可.【詳解】∵關(guān)于x的分式方程SKIPIF1<0(m為常數(shù))有增根,∴SKIPIF1<0,解得SKIPIF1<0,故答案為:SKIPIF1<0.【點睛】本題考查了分式方程的解法,增根的理解,熟練掌握分式方程的解法是解題的關(guān)鍵.40.分式方程SKIPIF1<0的解是_________.【答案】SKIPIF1<0【分析】找出分式方程的最簡公分母,方程左右兩邊同時乘以最簡公分母,去分母后再利用去括號法則去括號,移項合并,將x的系數(shù)化為1,求出x的值,將求出的x的值代入最簡公分母中進行檢驗,即可得到原分式方程的解.【詳解】解:SKIPIF1<0解:化為整式方程為:3﹣x﹣1=x﹣4,解得:x=3,經(jīng)檢驗x=3是原方程的解,故答案為:SKIPIF1<0.【點睛】此題考查了分式方程的解法.注意解分式方程一定要驗根,熟練掌握分式方程的解法是關(guān)鍵.41.(2017·江西·南昌市育新學(xué)校校聯(lián)考一模)分式方程SKIPIF1<0的解是_____.【答案】SKIPIF1<0【分析】根據(jù)解分式方程的步驟計算即可.【詳解】去分母得:SKIPIF1<0,解得:SKIPIF1<0,經(jīng)檢驗SKIPIF1<0是方程的解,故答案為:SKIPIF1<0.【點睛】本題考查解分式方程,正確計算是解題的關(guān)鍵,注意要檢驗.42.方程SKIPIF1<0的解為________.【答案】SKIPIF1<0【分析】根據(jù)方程兩邊同時乘以SKIPIF1<0,化為整式方程,進而進行計算即可求解,最后注意檢驗.【詳解】解:方程兩邊同時乘以SKIPIF1<0,SKIPIF1<0SKIPIF1<0解得SKIPIF1<0經(jīng)檢驗,SKIPIF1<0是原方程的解故答案為:SKIPIF1<0【點睛】本題考查了解分式方程,解分式方程一定要注意檢驗.43.(2023·內(nèi)蒙古赤峰·統(tǒng)考中考真題)方程SKIPIF1<0的解為___________.【答案】SKIPIF1<0【分析】依據(jù)題意將分式方程化為整式方程,再按照因式分解即可求出SKIPIF1<0的值.【詳解】解:SKIPIF1<0,方程兩邊同時乘以SKIPIF1<0得,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0或SKIPIF1<0.經(jīng)檢驗SKIPIF1<0時,SKIPIF1<0,故舍去.SKIPIF1<0原方程的解為:SKIPIF1<0.故答案為:SKIPIF1<0.【點睛】本題考查的是解分式方程,解題的關(guān)鍵在于注意分式方程必須檢驗根的情況.44.方程SKIPIF1<0的解為______________.【答案】SKIPIF1<0【分析】根據(jù)分式方程的解法可直接進行求解.【詳解】解:SKIPIF1<0SKIPIF1<0,∴SKIPIF1<0,經(jīng)檢驗:SKIPIF1<0是原方程的解.故答案為:x=3.【點睛】本題主要考查分式方程的解法,熟練掌握分式方程的解法是解題的關(guān)鍵.45.方程SKIPIF1<0的解是_____________.【答案】SKIPIF1<0,SKIPIF1<0【分析】先把兩邊同時乘以SKIPIF1<0,去分母后整理為SKIPIF1<0,進而即可求得方程的解.【詳解】解:SKIPIF1<0,兩邊同時乘以SKIPIF1<0,得SKIPIF1<0,整理得:SKIPIF1<0解得:SKIPIF1<0,SKIPIF1<0,經(jīng)檢驗,SKIPIF1<0,SKIPIF1<0是原方程的解,故答案為:SKIPIF1<0,SKIPIF1<0.【點睛】本題考查了分式方程和一元二次方程的解法,熟練掌握分式方程和一元二次方程的解法是解決本題的關(guān)鍵.46.分式方程SKIPIF1<0的解為__________.【答案】SKIPIF1<0【分析】直接利用通分,移項、去分母、求出SKIPIF1<0后,再檢驗即可.【詳解】解:SKIPIF1<0通分得:SKIPIF1<0,移項得:SKIPIF1<0,SKIPIF1<0,解得:SKIPIF1<0,經(jīng)檢驗,SKIPIF1<0時,SKIPIF1<0,SKIPIF1<0SKIPIF1<0是分式方程的解,故答案是:SKIPIF1<0.【點睛】本題考查了對分式分式方程的求解,解題的關(guān)鍵是:熟悉通分,移項、去分母等運算步驟,易錯點,容易忽略對根進行檢驗.47.(2023·江蘇連云港·統(tǒng)考中考真題)解方程組SKIPIF1<0【答案】SKIPIF1<0【分析】方程組運用加減消元法求解即可.【詳解】解:SKIPIF1<0①+②得SKIPIF1<0,解得SKIPIF1<0,將SKIPIF1<0代入①得SKIPIF1<0,解得SKIPIF1<0.∴原方程組的解為SKIPIF1<0【點睛】本題主要考查了解二元一次方程組,方法主要有:代入消元法和加減消元法.48.(2023·浙江臺州·統(tǒng)考中考真題)解方程組:SKIPIF1<0【答案】SKIPIF1<0【分析】把兩個方程相加消去y,求解x,再把x的值代入第1個方程求解y即可.【詳解】解:SKIPIF1<0①+②,得SKIPIF1<0.∴SKIPIF1<0.把SKIPIF1<0代入①,得SKIPIF1<0.∴這個方程組的解是SKIPIF1<0.【點睛】本題考查的是二元一次方程組的解法,熟練的利用加減消元法解方程組是解本題的關(guān)鍵.49.(2023·湖南常德·統(tǒng)考中考真題)解方程組:SKIPIF1<0【答案】SKIPIF1<0【分析】方程組利用加減消元法求解即可.【詳解】解:將①SKIPIF1<0得:SKIPIF1<0③SKIPIF1<0得:SKIPIF1<0將SKIPIF1<0代入①得:SKIPIF1<0所以SKIPIF1<0是原方程組的解.【點睛】此題考查了解二元一次方程組,利用了消元的思想,解題的關(guān)鍵是利用代入消元法或加減消元法消去一個未知數(shù).50.解方程組:SKIPIF1<0.【答案】SKIPIF1<0【分析】用加減消元法解二元一次方程組即可;【詳解】SKIPIF1<0.解:SKIPIF1<0,得SKIPIF1<0.把SKIPIF1<0代入①,得SKIPIF1<0.∴原方程組的解為SKIPIF1<0.【點睛】本題考查了二元一次方程組的解法,本題使用加減消元法比較簡單,當(dāng)然使用代入消元求解二元一次方程組亦可.51.解方程組SKIPIF1<0【答案】SKIPIF1<0【分析】利用加減消元法解二元一次方程組即可.【解析】解:SKIPIF1<0,①+②得3x=6,∴x=2,把x=2代入②,得y=0,∴原方程組的解是SKIPIF1<0.【點睛】本題考查了解二元一次方程組,解決本題的關(guān)鍵是掌握以上知識熟練運算.52.解二元一次方程組:2x+y=2,【分析】方程組利用加減消元法與代入消元法求出解即可.【解析】2x+y=2①8x+3y=9②法1:②﹣①×3,得2x=3,解得:x=3把x=32代入①,得y=∴原方程組的解為x=3法2:由②得:2x+3(2x+y)=9,把①代入上式,解得:x=3把x=32代入①,得y=∴原方程組的解為x=353.解方程組:SKIPIF1<0.【答案】SKIPIF1<0.【分析】利用加減消元法解方程組.【詳解】解:SKIPIF1<0.①+②,得SKIPIF1<0,∴SKIPIF1<0.將SKIPIF1<0代入②,得SKIPIF1<0,∴SKIPIF1<0.所以原方程組的解為SKIPIF1<0,【點睛】本題考查了解二元一次方程組,熟練掌握運算法則是解本題的關(guān)鍵.54.解方程組:SKIPIF1<0.【答案】SKIPIF1<0【分析】利用代入消元法解二元一次方程組即可.【詳解】解:SKIPIF1<0,把①代入②,得SKIPIF1<0,解得SKIPIF1<0.把SKIPIF1<0代入①,得SKIPIF1<0.∴原方程組的解是SKIPIF1<0.【點睛】本題考查解二元一次方程組,熟練掌握二元一次方程組的解法是解答的關(guān)鍵.55.解方程組:SKIPIF1<0.【答案】SKIPIF1<0.【詳解】分析:(1)根據(jù)代入消元法,可得答案.詳解:SKIPIF1<0由②得:x=-3+2y
③,把③代入①得,3(-3+2y)-y=-4,解得y=1,把y=1代入③得:x=-1,則原方程組的解為:SKIPIF1<0.點睛:此題考查了解二元一次方程組,利用了消元的思想,消元的方法有:代入消元法與加減消元法.56.(2023·湖北黃岡·統(tǒng)考中考真題)化簡:SKIPIF1<0.【答案】SKIPIF1<0【分析】先計算同分母分式的減法,再利用完全平方公式約分化簡.【詳解】解:SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0【點睛】本題考查分式的約分化簡,解題的關(guān)鍵是掌握分式的運算法則.57.(2023·山西·統(tǒng)考中考真題)解方程:SKIPIF1<0.【答案】SKIPIF1<0【分析】去分母化為整式方程,求出方程的根并檢驗即可得出答案.【詳解】解:原方程可化為SKIPIF1<0.方程兩邊同乘SKIPIF1<0,得SKIPIF1<0.解得SKIPIF1<0.檢驗:當(dāng)SKIPIF1<0時,SKIPIF1<0.∴原方程的解是SKIPIF1<0.【點睛】本題考查了分式方程的解法,熟練掌握解分式方程的方法是解題關(guān)鍵.58.解方程:SKIPIF1<0.【答案】x=﹣1【分析】根據(jù)解分式方程的步驟,先去分母化為整式方程,再求出方程的解,最后進行檢驗即可.【詳解】解:SKIPIF1<0,2x=x﹣2+1,x=﹣1,經(jīng)檢驗x=﹣1是原方程的解,則原方程的解是x=﹣1.【點睛】本題考查解分式方程,得出方程的解之后一定要驗根.59.(2023·廣西·統(tǒng)考中考真題)解分式方程:SKIPIF1<0.【答案】SKIPIF1<0【分析】去分母轉(zhuǎn)化為整式方程,求出整式方程的解得到x的值,經(jīng)檢驗即可得到分式方程的解.【詳解】解:SKIPIF1<0去分母得,SKIPIF1<0移項,合并得,SKIPIF1<0檢驗:當(dāng)SKIPIF1<0時,SKIPIF1<0,所以原分式方程的解為SKIPIF1<0.【點睛】此題考查了解分式方程,解分式方程的基本思想是“轉(zhuǎn)化思想”,把分式方程轉(zhuǎn)化為整式方程求解.解分式方程一定注意要驗根.60.解分式方程:SKIPIF1<0.【答案】SKIPIF1<0【分析】先將分式方程化成整式方程,然后求解,最后檢驗即可.【詳解】解:SKIPIF1<0SKIPIF1<0.SKIPIF1<0.經(jīng)檢驗,SKIPIF1<0是原方程的解.【點睛】本題主要考查了分式方程的解法,將將分式方程化成整式方程是解題的關(guān)鍵,檢驗是解答本題的易錯點.61.解方程:SKIPIF1<0.【答案】無解【分析】將分式去分母,然后再解方程即可.【詳解】解:去分母得:SKIPIF1<0整理得SKIPIF1<0,解得SKIPIF1<0,經(jīng)檢驗,SKIPIF1<0是分式方程的增根,故此方程無解.【點睛】本題考查的是解分式方程,要注意驗根,熟悉相關(guān)運算法則是解題的關(guān)鍵.62.解方程SKIPIF1<0.【答案】SKIPIF1<0【分析】先將方程兩邊同時乘以SKIPIF1<0,化為整式方程后解整式方程再檢驗即可.【詳解】解:SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,檢驗:將SKIPIF1<0代入SKIPIF1<0中得,SKIPIF1<0,∴SKIPIF1<0是該分式方程的解.【點睛】本題考查了分式方程的解法,解決本題的關(guān)鍵是牢記解分式方程的基本步驟,即要先將分式方程化為整式方程,再利用“去括號、移項、合并同類項、系數(shù)化為1”等方式解整式方程,最后不能忘記檢驗等.63.解方程:SKIPIF1<0.【答案】SKIPIF1<0【分析】按照解分式方程的方法和步驟求解即可.【詳解】解:去分母(兩邊都乘以SKIPIF1<0),得,SKIPIF1<0.去括號,得,SKIPIF1<0,移項,得,SKIPIF1<0.合并同類項,得,SKIPIF1<0.系數(shù)化為1,得,SKIPIF1<0.檢驗:把SKIPIF1<0代入SKIPIF1<0.∴SKIPIF1<0是原方程的根.【點睛】本題考查了分式方程的解法,熟知分式方程的解法步驟是解題的關(guān)鍵,尤其注意解分式方程必須檢驗.64.(2023·湖南·統(tǒng)考中考真題)解不等式組:SKIPIF1<0,并把它的解集在數(shù)軸上表示出來.
【答案】不等式組的解集為:SKIPIF1<0.畫圖見解析【分析】先解不等式組中的兩個不等式,再在數(shù)軸上表示兩個不等式的解集,從而可得答案.【詳解】解:SKIPIF1<0,由①得:SKIPIF1<0,由②得:SKIPIF1<0,∴SKIPIF1<0,在數(shù)軸上表示其解集如下:
∴不等式組的解集為:SKIPIF1<0.【點睛】本題考查的是一元一次不等式組的解法,在數(shù)軸上表示不等式組的解集,掌握不等式組的解法與步驟是解本題的關(guān)鍵.65.解不等式組:SKIPIF1<0【答案】SKIPIF1<0【分析】根據(jù)一元一次不等式組的解法直接進行求解即可.【詳解】解:SKIPIF1<0,由SKIPIF1<0,得SKIPIF1<0;由SKIPIF1<0,得SKIPIF1<0;∴原不等式組的解集為SKIPIF1<0.【點睛】本題主要考查一元一次不等式組的解法,熟練掌握一元一次不等式組的解法是解題的關(guān)鍵.66.(2023·山東·統(tǒng)考中考真題)解不等式組:SKIPIF1<0.【答案】SKIPIF1<0【分析】分別求出各個不等式的解,再取各個解集的公共部分,即可.【詳解】解:解SKIPIF1<0得:SKIPIF1<0,解SKIPIF1<0得:SKIPIF1<0,∴不等式組的解集為SKIPIF1<0.【點睛】本題主要考查解一元一次不等式組,熟練掌握解不等式組的基本步驟,是解題的關(guān)鍵.67.(2023·福建·統(tǒng)考中考真題)解不等式組:SKIPIF1<0【答案】SKIPIF1<0【分析】分別求出每一個不等式的解集,根據(jù)口訣:同大取大、同小取小、大小小大中間找、大大小小找不到確定不等式組的解集.【詳解】解:SKIPIF1<0解不等式①,得SKIPIF1<0.解不等式②,得SKIPIF1<0.所以原不等式組的解集為SKIPIF1<0.【點睛】本題考查了解一元一次不等式組,正確掌握一元一次不等式解集確定方法是解題的關(guān)鍵.68.解不等式組:SKIPIF1<0【答案】SKIPIF1<0【分析】分別求出不等式組中兩不等式的解集,找出解集的公共部分即可.【詳解】解:SKIPIF1<0,由①得:x>2.5,由②得:x≤4,則不等式組的解集為SKIPIF1<0.【點睛】本題主要考查實數(shù)的運算與解一元一次不等式組.69.(2023·湖南永州·統(tǒng)考中考真題)解關(guān)于x的不等式組SKIPIF1<0【答案】SKIPIF1<0【分析】分別解不等式組的兩個不等式,再取兩個不等式的解集的公共部分,即為不等式組的解集.【詳解】解:SKIPIF1<0,解①得,SKIPIF1<0,解②得,SKIPIF1<0,SKIPIF1<0原不等式組的解集為SKIPIF1<0.【點睛】本題考查了解一元一次不等式組的解集,取兩個不等式的解集的公共部分的口訣為:“大大取大,小小取小,大小小大取中間,大大小小則無解”,熟知上述口訣是解題的關(guān)鍵.70.(2023·江蘇蘇州·統(tǒng)考中考真題)解不等式組:SKIPIF1<0【答案】SKIPIF1<0【分析】分別求出每一個不等式的解集,根據(jù)口訣:同大取大、同小取小、大小小大中間找、大大小小找不到確定不等式組的解集.【詳解】解:SKIPIF1<0解不等式①得:SKIPIF1<0解不等式②得:SKIPIF1<0∴不等式組的解集為:SKIPIF1<0【點睛】本題考查了解一元一次不等式組,正確掌握一元一次不等式解集確定方法是解題的關(guān)鍵.71.解不等式SKIPIF1<0.【答案】SKIPIF1<0【分析】不等式去分母,去括號,移項合并,把x系數(shù)化為1,即可求出解.【詳解】解:SKIPIF1<0,去分母,得SKIPIF1<0,去括號,得SKIPIF1<0,移項,得SKIPIF1<0,合并同類項,得SKIPIF1<0,系數(shù)化成1,得SKIPIF1<0.【點睛】本題考查了解一元一次不等式,解此題的關(guān)鍵點是能正確根據(jù)不等式的性質(zhì)進行變形,注意:移項要變號.72.(2023·湖南·統(tǒng)考中考真題)解不等式組:SKIPIF1<0【答案】SKIPIF1<0【分析】分別求出每一個不等式的解集,根據(jù)口訣:同大取大、同小取小、大小小大中間找、大大小小找不到確定不等式組的解集.【詳解】解:SKIPIF1<0解不等式①得:SKIPIF1<0解不等式②得:SKIPIF1<0∴不等式組的解集為:SKIPIF1<0.【點睛】本題考查了解一元一次不等式組,正確掌握一元一次不等式解集確定方法是解題的關(guān)鍵.73.(2023·湖南岳陽·統(tǒng)考中考真題)解不等式組:SKIPIF1<0【答案】SKIPIF1<0【分析】按照解不等式組的基本步驟求解即可.【詳解】∵SKIPIF1<0,解①的解集為SKIPIF1<0;解②的解集為SKIPIF1<0,∴原不等式組的解集為SKIPIF1<0.【點睛】本題考查了不等式組的解法,熟練掌握解不等式組的基本步驟是解題的關(guān)鍵.74.解不等式:SKIPIF1<0.【答案】SKIPIF1<0【分析】利用去分母、去括號、移項、合并同類項、系數(shù)化為1即可解答.【詳解】SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.【點睛】本題考查了一元一次不等式的解法,熟練運用一元一次不等式的解法是解決問題的關(guān)鍵.75.(2023·上?!そy(tǒng)考中考真題)解不等式組SKIPIF1<0【答案】SKIPIF1<
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