(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
答
(X^2-0.3X+0.5)(X-0.2)
=X^2*(X-0.2)-0.3X(X-0.2)+0.5(X-0.2)
=x^3-0.5x^2+0.56x-0.1
答
x^3-0.5x^2+0.16x-0.1
答
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