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0.58×9.9的简便算法

0.58x9.9 =0.58x(10-0.1) =0.58x10-0.58x0.1 =5.8-0.058 =5.742

0.58x9.9 =0.58x(10-0.1) =0.58x10-0.58x0.1 =5.8-0.058 =5.742 谢谢,请采纳

58.3*9.9 =58.3*10-58.3*0.1 =583-5.83 =577.17

1.58乘九点9+0点158 =1.58x9.9+1.58x0.1 =1.58x(9.9+0.1) =1.58x10 =15.8 希望能帮到你

5.8*9.9*0.58 =5.8*5.8*0.99 =(6-0.2)*(6-0.2)*(1-0.01) =(36-2.4+0.04)(1-0.01) =33.64*(1-0.01) =33.64-0.3364 =33.3036

=5.8×9.9+5.8×0.1 =5.8×(9.9+0.1) =5.8×10 =58

9.58+0.81-9.58+0.19 =(9.58-9.58)+(0.81+0.19) =0+1 =1

6.58*99.9+0.658 =6.58*99.9+6.58*0.1 =6.58*(99.9+0.1) =6.58*100 =658

然后积除以100,答案。

5.8x9.9+0.58 =5.8x9.9+5.8x0.1 =5.8x(9.9+0.1) =5.8x10 =58

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