3(x+1)^2-(5x+1)(x-1)+2x(x-1) 计算
问题描述：
3(x+1)^2-(5x+1)(x-1)+2x(x-1) 计算
3(x+1)^2-5(x+1)(x-1)+2x(x-1)
答
原式=3(x²+2x+1)-(5x²-4x-1)+2x(x-1)
=3x²+6x+1-5x²+4x+1+2x²-2x
=8x+23(x+1)^2-5(x+1)(x-1)+2x(x-1)呢采纳我，重新问