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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

(1)7.8÷[32×(1-58)+3.6]=7.8÷[32×38+3.6]=7.8÷[12+3.6]=7.8÷15.6=0.5;(2)20513-2.73-8.27+1713=(20513+1713)-(2.73+8.27)=22-11=11;(3)15×(115+117)×17=15×115×17+15×117×17=17+15=32;(4)4.3×1.8+86×0.91=43×0.18+43×2×0.91=43...

(1)32.5+3.6×2.5÷0.48,=32.5+9÷0.48,=32.5+18.75,=51.25;(2)22- 3 4 × 1 2 - 5 8 ,=22- 3 8 - 5 8 ,=22-( 3 8 + 5 8 ),=22-1,=21;(3)299÷(299+ 299 300 ),=299÷ 299×300+299 300 ,=299× 300 299×300+299 ,= 300 300+1 ,...

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.是4.5

1 4 ×(4.85 ÷ 5 18 -3.6+6.15×3 3 5 )+[5.5-1.7×(1 2 3 + 19 21 )]= 1 4 ×(4.85×3.6-3.6+6.15×3.6)+[5.5-1.7×2 4 7 ]= 1 4 ×[10×3.6]+[5.5-4 13 35 ]= 1 4 ×36+1 9 70 =9+1 9 70 =10 9 70 .故答案为:10 9 70 .

(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÷...

5.5×5分之4+3.6÷1.2-6又2分之1×0.6 =5.5×0.8+3-13/2×3/5 =4.4+3-39/10 =74/10-39/10 =35/10 =3.5 (2又6分之5-1又4分之1+3又9分之5)÷(1-36分之35) =(17/6-5/4+32/9)÷1/36 =(17/6-5/4+32/9)×36 =102-45+128 =185

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

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