[2(x-1)^2+(x-1)^3]÷(1-x)
问题描述:
[2(x-1)^2+(x-1)^3]÷(1-x)
答
[2(x-1)^2+(x-1)^3]÷(1-x)
=[2(1-x)^2-(1-x)^3]÷(1-x)
=2(1-x)-(1-x)^2
=1-x^2