化简:(2x-1)²-(3x+1)×(3x-1)-5x(1-x)=
问题描述:
化简:(2x-1)²-(3x+1)×(3x-1)-5x(1-x)=
答
(2x-1)²-(3x+1)×(3x-1)-5x(1-x)
=4x²-4x+1-9x²+1-5x+5x²
=-9x+2