-4a^3+6a^2b-2ab和x-x²-1/4两个分解因式

问题描述:

-4a^3+6a^2b-2ab和x-x²-1/4两个分解因式

-4a^3+6a^2b-2ab^2
=-2a(2a^2-3ab+b^2)
=-2a(a-b)(2a-b)
x-x^2-1/4
=-x^2+x-1/4
=-(x^2-x+1/4)
=-(x-1/2)^2