(X^2-0.3X+0.5)(X-0.2)最好简便

问题描述:

(X^2-0.3X+0.5)(X-0.2)最好简便

没什么简便的,就是乘出来
(X^2-0.3X+0.5)(X-0.2)
=X^3-0.2X^2-0.3X^2+0.06X+0.5X-0.1
=X^3-0.5X^2+0.56X-0.1