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9.1×4.8×4又2分之1÷1.6÷20分之3÷1.3 要简便运算

9.1*4.8*7又二分之一÷1/4÷1.3÷1.6 =(9.1÷1.3)×(4.8÷1.6)×15/2×4 =7×3×30 =630

简便运算 1.3×4.62+9.1×0.34 =1.3×4.62+1.3×2.38 =1.3×(4.62+2.38) =1.3×7 =9.1

9.1×3.6×4又4/5÷1又3/10÷3/5÷6/25 =(91/10)×(18/5)×(24/5)×(10/13)×(5/3)×(25/6) =140

9.1x3.6x4又5分之4÷1又10分之3÷5分之3÷25分之6 =9.1x3.6x4.8÷1.3÷0.6÷0.24 =(9.1÷1.3)x(3.6÷0.6)x(4.8÷0.24) =7x6x20 =840

算式9.1÷1.3÷0.4。

解:(9.1x4.8x7.5)÷(2.5x1.3)x16 =(9.1÷1.3)x(7.5÷2.5)x4.8x16 =7x3x4.8x2x8 =21x8x4.8x2 =168x9.6 =168x(10-0.4) =1680-67.2 =1612.8

去掉括号调换位置,不就得了……

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