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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

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

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

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

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

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

9.6x5·8+4x0.58 =96x0.58+4x0.58 =0.58x(4+96) =0.58x100 =58

9.62/0.58 =962/58 =(928+34)/58 =16+34/58 商是16,余数为0.34

(1)0.58×0.24=0.1392; 0.5 8 ×0.2 4 2 3 21 1 60. 1 3 9 2验算: 0.2 4 ×0.5 8 1 9 2 1 2 00.1 3 9 2(2)1.57÷3.9≈0.40; 0.4 0 23.91.5 7 1 5 6 1 0 0 7 82 2(3)3.42×0.25=0.855; 3.4 2 ×0.2 51 7 1 06 8 40.8 5 5 0(4)70.7÷33=2.?14?...

那是因为返话费,说的58元不限量,其实就是让你改套餐,然后分多少个月,反你话费。以后你要改低套餐就不好改了。哎,套路多多

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