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3.6×7.6×9.3÷(1.9×3.1×1.8)用简便计算

1972*37+197.2*1.9-986*70.38 =1972*(37+0.19-35.19) =1972*2 =3944 7.2*4.5*9.3/(1.8*1.5*3.1) =4*3*3 =36 12.6*7.6*2.32/1.9/1.4/2.9 =12.6*7.6*2.32/(1.9*1.4*2.9) =9*4*0.8 =28.8

8.4÷7.6÷(4.2÷1.9) =8.4÷7.6÷4.2*1.9 =8.4÷4.2*1.9÷7.6 =2*1.9÷7.6 =(2*1.9)÷(2*3.8) =1.9÷3.8 =1÷2 =0.5

解:根据提取公因式的简便方法, 原式=4/7x6/9+4/7x1/9 =4/7x(6/9+1/9) =4/7x7/9 =4/9

6.9+1.9×0.2÷7.6 =6.9+0.38÷7.6 =6.9+0.05 =6.95

原式 =(7.6x2.8+1.4x4x1.9-2.8x1.4)÷2.5x4 =(7.6x2.8+1.4x7.6-2.8x1.4)÷2.5x4 =[7.6x(2.8+1.4)-2.8x1.4]÷2.5x4 =(7.6x4.2-2.8x1.4)÷2.5x4 =(7.6x3x1.4-2.8x1.4)÷2.5x4 =(22.8x1.4-2.8x1.4)÷2.5x4 =20x1.4÷2.5x4 =20÷2.5x1.4x4 =8x1.4x4 =11.2x4...

12.6*7.6*2.32/1.9*1.4*2.9

1.28÷0.25×4 =1.28÷1/4×4 =1.28×4×4 =20.48 7.6×3.8÷1.9 =7.6×2 =15.2 2.4÷1.25×8 =2.4÷5/4×8 =2.4×4/5×8 =15.36 1、3题目有误,如1.28÷(0.25×4)=1.28÷1=1 2.4÷(1.25×8)=2.4÷10=0.24

原式=9/13*(1/7+6/7)=9/13

(1)337-298=337-300+2,=37+2,=39;(2)0.8-0.2×1.9÷7.6=0.8-0.38÷7.6.=0.8-0.05,=0.75;(3) 7 13 ÷8+ 1 8 × 5 13 = 7 13 × 1 8 + 1 8 × 5 13 ,=( 7 13 + 5 13 )× 1 8 ,= 12 13 × 1 8 ,= 3 26 ;(4) 6 7 -( 4 5 - 1 7 ) = 6 7 +...

(1)9.6-11÷7+17×4=9.6-117+47=9.6-(117-47)=9.6-1=8.6;(2)318×7.4-318+3.6×3.125=3.125×7.4-3.125+3.6×3.125=3.125×(7.4-1+3.6)=3.125×10=31.25.

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