Question

21.4×0.045怎么简便运算？

Answer 1

可以把0.045转换为5*0.009
21.4*5*0.009=（21+0.4）*5*0.009=（21*5+0.4*5）0.009=（105+2）*0.009=107*0.009=（100+7）*0.009=0.9+0.063=0.963

Answer 2

21.4×0.045=21.4×5×0.009=107×0.009=（100+7）×0.009=100×0.009+7×0.009=0.9+0.063=0.963

Answer 3

21.4*0.045这道题考的是初中的除法口决除余一个数等于乘以这个数的倒数，举个例子4分之2的倒数是2分之4，21.4*0.045等于0.945。

Answer 4

21.4X0.045=21.4X5x0.009=107X0.009=(100十7)X0.009=100X0.009十7X0.009=0.9十0.063=0.963

Answer 5

21.4×5×0.009
=107×0.009
=0.963
21.4×0.045=0.963