小升初计算专项练习(一)年月日一、脱式计算(能简便的简便运算)(1)0.25×3.2×1.25(2)9÷15-35÷9(3=0.25×(4×0.8)×1.25=0.25×4×(0.8×1.25)=1=9×5-35×19=45-115=4414156.35-15-325+4.65=6.35+4.65-(15+325)=11-145=815(4)69×75%+7.5×3.1(5)(57+227)×7+1327(6)75÷[38÷(14-18)]=6.9×7.5+7.5×3.1=7.5×(6.9+3.1)=75=57×7+227×7+1327=5+(1427+1327)=6=75÷[38×8]=75÷3=715(7)452995(8)353.246.80.310(9)156208623=4299=23=53.20.346.80.3=(53.246.8)0.3=1000.3=30=620242423203=622230243=1204=80二、解方程(1)144x解:144xx1630.20.165xx解:0.60.20.16xx0.80.16x0.160.8x0.2x(3)7(x-12)=9.1(4)73:6418x解:129.17x121.3x1.312x13.3x解:371846x3214x3214x28x小升初计算专项练习(二)年月日一、脱式计算(能简便的简便运算)(1)25×13×4=25×4×13=100×13=1300(2)7.3-0.37+2.7-0.63=(7.3+2.7)-(0.37+0.63)=10-1=9(3)38161111631811161163811111611616(4)6.39÷0.25÷4(5)44.55.580%5(6)175243128=6.39÷(0.25×4)=6.39÷1=6.39=444.55.555=4(4.55.5)5=4105=8=1752424243128=8+14-15=7(7)12.5×(8+0.8)(8)14518158(9)355883=12.5×8+12.5×0.8=100+10=110=11816=118318=29=3388=34二、解方程(1)291.591873.53x(2)1131121132xxxx91.561261273.573.561273.5xxx61218x612121812x630x1131121123xxxx11312123xx771123xx66306x5x1131121132xxxx77161623xx211141xx21211414xx2121142114141421xxxx735x77357x5x(3)2x+30%=9.2(4)2.1x=78解:2x+0.3-0.3=9.2-0.32x=8.92x÷2=8.9÷2x=4.45解:7x=2.1×87x÷7=16.8÷7x=2.4小升初计算专项练习(三)年月日一、脱式计算(能简便的简便运算)(1)26-7.28-12.72=26-(7.28+12.72)=26-20=6(2)5.8×4.1+5.9×5.8=5.8×(4.1+5.9)=5.8×10=58(3)1211.4854=12718554=17820208=1384=16(4)2.73×99+2.73=2.73×99+2.73×1=2.73×(99+1)=2.73×100=273(5)53938=538138()=553813838=5538=5538(6)1780%0.743=4170.7543=16570.720203=2170.7203=2130.7207=0.450.7=1.15(7)334444=3134444=3314444()=9116=916(8)120-52-48=120-(52+48)=120-100=20(9)537298=53727298=4027=13二、解方程(1)913448x解:9113144484xxx139484x1339348848x11548x111514484xx=152(2)115::3209x解:1513920x11336x11363x112x(3)1.40.67.8x解:1.47.80.6x1.48.4x8.41.4x6x(4)15460x解:1544604x15240x151524015x16x小升初计算专项练习(四)年月日一、脱式计算(能简便的简便运算)(1)63647777=77346677=232=132(2)2754.24.899=27(54.24.8)()99=591=58(3)373.30.7550.75410=3.30.750.755.70.75=(3.35.71)0.75=100.75=7.5(4)12130%27=1272710...