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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 谢谢,请采纳

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

0.58+8.5×9.9 =8.5x0.1-0.27+8.5×9.9 =8.5x(0.1+9.9)-0.27 =85-0.27 =84.73

=5.8×9.9+5.8×0.1 =5.8x(9.9+0.1) =5.8X10 =58

5.8*9.9+0.58 =5.8*9.9+5.8*0.1 关键在于为这2个加数构造2个相等的因数,这里构造了5.8 也可以是0.58 =5.8*10 提取这个因数 =58

0.58×9.96 =0.58×(1-0.04) =0.58×1-0.58×0.04 =0.58-0.0232 =0.5568 你好,本题已解答,如果满意 请点右下角“采纳答案”。

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

21-0.7×0.6-9.58 =21-0.42-9.58 =21-(0.42+9.58) =21-10 =11 你好,本题已解答,如果满意 请点右下角“采纳答案”。

5.8*9.9 =5.8*(10-0.1) =5.8*10-5.8*0.1 =58-0.58 =57.42

5.8x9.28÷0.58 =5.8÷0.58x9.28 =10x9.28 =92.8

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