199×0.61怎么简算?

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199×0.61怎么简算?
199×0.61怎么简算?

199×0.61怎么简算?
200*0.61-1*0.61
=122-0.61
=121.39

(200-1)X0.61=0.61X200-0.61

[200-1]×0.61

(200-1)*(0.6+0.01)=120+2-0.6-0.01=121.39。

436 200-1 =636-1 =635 祝愉快O(∩_∩)O~ 436 200-1 436 199 =436 200-1 =636-1 =635 436 199=436 200-1=635 436

(200-1)*0.61