Question

54.9×0.38=用简便计算怎么算？

Answer 1

54.9×0.38=20.862

Answer 2

54.9×0.38
=55×0.38—0.1×0.38
=50×0.38+5×0.38—0.1×0.38
=19+1.9—0.038
=20.862

Answer 3

54.9*0.38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4，54.9*0.38等于20.862。

Answer 4

：54.9x0.38=(55-0.1)x(0.4-0.02)=55x(0.4-0.02)-0.1x(0.4-0.02)=22-1.1-0.04+0.002=20.862。

Answer 5

54.9×0.38=用简便计算怎么算？
54.9x0.38
=（55-0.1）x0.38
=55x0.38-0.1x0.38
=20.9-0.038
=20.862