(2x-2分之1)²-(x-1)(2x+2) 等于什么

问题描述:

(2x-2分之1)²-(x-1)(2x+2) 等于什么

(2x-2分之1)²-(x-1)(2x+2)
=4x²-2*2x*1/2+1/4-(2x²+2x-2x-2)
=4x²-2x+1/4-2x²-2x+2x+2
=2x²-2x+9/4