完整小升初簡便計(jì)算有答案

第一題簡易計(jì)算.151-x5+-x5+-X108 8 8*

,475—9.63+(8.25—L37);139x137138139x137138+137x1138答案，5+，5+，5+，5+I1。TOC\o"1-5"\h\z1 1 1=-x5+ - x25+ -X108 8 81=-x(5+25+10)O1=—x408=5;475-9.63+(8.25-1.37)(2)=4.75-9.63+8.25-1.37=(475+8.25)-(9.63+L37)

=13-11=2;137139x——+137x1138=137x^=137x(=137x1381391381401381138=137x^=137x(=137x138139138140138+137乂擊+lk)=(138-l)x140138=138x^-lx^138=14。-賽138簡算練習(xí)7.48+3.17-(2.48-6.83)答案7.48i3.17-2.4SI6.83=(7.48-2.48)I(3.17I6.83)=5I10=15第二題9999?+19999.答案.99992+19999解： ，=9999x9999+9999+10000=9999x(9999+1)+10000,=9999x10000+10000,=10000x(9999+1),=10000x10000,=100000000第三題(2011+2012x2010)-(2011x2012-1)答案(2011+2012x2010)-(2011x2012-1),=[2011+(2011+1)x2010]+(2011x2012-1),=(2011+2011x2010+2010)一(2011x2012-1),=[2011x(1+2010+1)-1]/(2011x2012-1),=(2011x2012-1)-(2011x2012-1),=1.第四題答案■⑶8+7—— —1—1j29 9（7石一1石）一（3*“L2；=1第五題77I770x6^1-1答案3333B7-x77I770x6Wl-2 1=333387x77I(77x10)xt?Wl；=33338T：x77|77x(10x66661；)=箝箝8T：x77I77x10x(6^1I；)=福才朋『：然仃|77x(6WWlf=3招禍T；x77I77然的枳=(招箝87：I666612^)x77=1000000x77=7000000第六題計(jì)算：999x7+111x27答案解：999x7+111x27=111x9x7+111x27=111x(7x9+27)=111x90=9990修改一下。做練習(xí)題0.9999x0.7+0.1111X2.7練習(xí)題24X(11-3-1-1)

12863第七題簡便運(yùn)算：81.5x15.8+81.5x51.8+67.6x18.5答案據(jù)題意，觀察算式，仔細(xì)分析，本題可兩次運(yùn)用乘法的分配律進(jìn)行簡便計(jì)算,據(jù)此解答即可.答案解:81.5x15.8+81.5x51.8+67.6x18.5=81.5x(15.8+51.8)+67.6x18.5=81.5x67.6+67.6x18.5=67.6x(81.5+18.5)=67.6x100=6760.故答案為：6760.第八題1993^1994-1* '1993Ml992乂1994答塞洋解考點(diǎn):繁分散的化簡交題：計(jì)算問題（巧算速算）分析：把分子中的1993看作1992+1,運(yùn)用乘法分配律計(jì)算，使它變成與分母相同或相近的部分；進(jìn)而簡算即可.解答:解匚1993^1984-1解答:解匚1993十1992T9940992十1）叮994<1199”1992Ml9941992,199441994門1993+1992*19941993」1992域19941993n992Ml994點(diǎn)評:此題解答的關(guān)犍在于運(yùn)用運(yùn)算定律使分子分母變得部分相同或全部相同，達(dá)到簡算的目的.第九題簡便計(jì)算362十548x361362x548-186答案詳解362+548x361362x548-186'_362+548x361一(361十1)x548-186'_362十548x361-361x548+548-186=362+548x361-361x548+3621=1.解析362+548x361原式: (361+1)x548-