199×0.61怎么简算?
问题描述：
199×0.61怎么简算?
答
[200-1]×0.61
答
（200-1）*0.61
答
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
答
(200-1)X0.61=0.61X200-0.61
答
200*0.61-1*0.61
=122-0.61
=121.39
答
（200-1）*(0.6+0.01)=120+2-0.6-0.01=121.39。