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9.5 ÷(1.9x0.8)簡便計算 ,

0.8x1.9+0.8x0.6 =0.8x(1.9+0.6) =0.8x2.5 =2

运用了乘法交换律和乘法结合律。 原式 =(1.9x0.8)x12.5 =1.9x(0.8x12.5) =1.9x10 =19

3.6x1.9+3.6x8.1 =3.6×(1.9+8.1) =3.6×10 =36

你好! 9.14×1.25-1.14÷0.8 =9.14x1.25-1.14x1.25 =(9.14-1.14)x1.25 =8x1.25 =10 很高兴为你解答,希望能够帮助到你。有不明白的地方请追问,满意请采纳。谢谢!

等等我来。

1.7-1.7x0.2÷6.8 =(1.7x6.8-1.7x0.2)÷6.8 =1.7x6.6÷6.8 =1.7x6.6÷(1.7x4) =1.65 1.25x3.2x0.25 =1.25x0.8x4x0.25 =(1.25x0.8)x(4x0.25) =1x1 =1 4.65x5.4+5.4x5.35 =(4.65+5.35)x5.4 =10x5.4 =54 9.4÷{(1.3+1.4)÷0.27] = 9.4÷{2.7÷0.27] = 9.4...

9/17×34÷4分之九简便计算 =18x4/9 =8

7.5X2.3+1.9X2.5+12.5X0.4 =2.5*3*2.3+1.9*2.5+2.5*5*0.4 =2.5*(3*2.3+1.9+5*0.4) =2.5*(6.9+1.9+2) =2.5*10.8 =2.5*10+2.5*0.8 =25+2 =27

1.9-1.9x0.9 =1.9x(1-0.9) =1.9x0.1 =0.19 5.4/(3.94+0.86)x0.8 =5.4/4x0.8 =54x0.8/4 =54x0.2 =10.8 如有帮助请采纳,

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