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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

原式 =(12.6÷1.4)x(7.6÷1.9)x(2.32÷2.9) =9x4x0.8 =36x0.8 =28.8 供参考。

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

原式=(12.6÷1.4)×(7.6÷1.9)×(2.32÷2.9) =9×4×0.8 =36×0.8 =28.8 望采纳,谢谢

(3.3×6.3×0.6)÷(1.8+2.7×1.9) ()分子分母同除以0.9) = (3.3×7×0.6)÷(2+3×1.9) = (3×1.1×7×0.6)÷(2+5.7) = (3×7.7×0.6)÷(7.7) = 3×0.6 = 1.8

14-7.32-2.68 =14-(7.32+2.68) =14-10 =4 0.8×(4.3×1.25) =0.8×1.25×4.3 =1×4.3 =4.3 1.23+3.4-0.23+6.6 =1.23-0.23+(3.4+6.6) =1+10 =11 28.6×101-28.6 =28.6×(101-1) =28.6×100 =2860 6.032+3.6+1.98 =9.632+1.98 =9.632+2-0.02 =11.632-0.2...

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

(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.

(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 +...

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