2023-2024學(xué)年廣東省深圳市光明區(qū)七年級（下）期末數(shù)學(xué)答案

123456789DBCABDCDAB=4··························································································4分（2）(2x+y)(x?y).解：原式=2x2?2xy+xy?y2···································································7分?y2··········································································8分解：原式=÷y·····················································2分÷y········································································3分=5y?4x；··············································································4分原式=5×1-4×（-1）············································································5分=9.·······················································所以該路口紅綠黃燈的總時長為：30÷=93秒，····································4分,·······································································解得x=60.··························································答：路口綠燈設(shè)置的時長為60秒.··························································6分解1）底邊長x，三角形面積y；····················································2分（2）6；····················································································3分（3）y=3x.············································································5分（4）9，36.················································20共9分）①兩直線平行，內(nèi)錯角相等；································································1分②DC（寫CD也給分······································································2分③CD（寫DC也給分······································································3分④AB；····························································································4分⑤EF；····························································································5分⑥SAS；···························································································6分⑦上EDF···························································································7分⑧全等三角形的對應(yīng)角相等；································································8分⑨內(nèi)錯角相等，兩直線平行.·································································9分21共9分）2.·······························2222.······································22.···············································9分22.···············································9分（1）5；············································································