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7.8÷[32×(1b.5%)+3.6] [3/2%(1/5+1/2)]÷1/10×

7.8÷[32×(1-62.5%)+3.6] =7.8÷[32×37.5%+3.6] 、 =7.8÷[12+3.6] =7.8÷15.6 =0.5(1/2) [3/2-(1/5+1/2)]÷1/10×10 =[3/2×10-(1/5+1/2)×10]×10 =[15-3-5]×10 =7×10 =70

①3.6-2.8+6.4-7.2,=(3.6+6.4)-(2.8+7.2),=10-10,=0;② 7.2×[(7.8+ 1 5 )÷0.4] ,=7.2×[8÷0.4],=7.2×20,=144;③(6.9-3.15)÷0.3×0.8,=3.75÷0.3×0.8,=12.5×0.8,=10;④ 4 5 ÷( 5 6 × 3 5 )-1 1 2 ,= 4 5 ÷ 1 2 -1 1 2 ,= 8 5 - 3...

(1)1+2-3+4+5-6+7+8-9+10…+28+29-30,=(1+2-3)+(4+5-6)+(7+8-9)…+(28+29-30),=0+3+6+…27,=(0+27)×10÷2,=270÷2,=135;(2)7777×9+1111×37,=1111×7×9+1111×37,=1111×(63+37),=1111×100,=111100;(3)5123×35+7134×47+9145...

3.6÷(1.2+0.5)×5.1 =3.6÷1.7×5.1=3.6×3=10.8

(1)x÷0.7+1.2乘3=4.1 x*7/10=4.1-3.6 x*7/10=0.5 x=5/7 (2)6.4x+3.6x=100 10x=100 x=10 (3)(x+4.6)÷1.2=7.8 x+4.6=6.5 x=6.5-4.6 x=0.9 (4)1.6x-0.4x=24 0.8x=24 x=30 (5)0.75乘18÷0.1 =7.5×18 =135

2.5×5=12.5, 10+0.4=10.4, 2.5×0.4=1, 7.1×0.2=1.42, 1÷0.1=10, 3.6÷0.4=9, 0.2×3.1=0.62, 4.4-1.1=3.3, 10+3.4=13.4, 1-0.87=0.13, 6.3×2=12.6, 1.25×80=100, 0.2×0.3=0.06, 4.8÷1.2=4, 2.5×0.4=1, 8×12.5=100, 7÷3.5=2, 36÷...

15.6÷【32×(1-5/8)÷3.6】 =15.6÷(32×3/8÷3.6) =15.6÷[32×1/8÷(3.6÷3)] =15.6÷(4÷1.2) =15.6×(1.2÷4) =15.6×0.3 =4.68

0.1÷0.001-(39又7/12×3又3/5÷39又7/12+3.6+5又5/8+0.36×33.75) =100-(3.6+3.6+5.625+12.15) =100-24.975 =75.025

(1)0.3×0.2=0.06 4.2÷0.7=6 1.2×5=6 0.25×4=1 (2)12-1.2=10.8 2.4×10=24 3.6÷12=0.3 0.78÷0.15=5.2 (3)0.4×0.02=0.008 3.5+7.6=11.1 1.23÷3=0.41 2.4×2.5=6 (4)16÷1.6=10 0.9÷0.01=90 7÷0.25=28 99×0.25=24.75

(1)3.6×5÷3.6×5=25 87.04÷0.4²=544 9÷4.5=2小时 4.5÷9=0.5公顷 18-21.6×18÷24.3=2 3.5×(0.32÷0.4)=2.8 (8.1+4.5)÷(7.52-1.5)=

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