2x-1/x+1+3x+1/x+2-5x-11/x-1=
问题描述:
2x-1/x+1+3x+1/x+2-5x-11/x-1=
答
(2x-1)(x+2)(x-1)+(3x+1)(x+1)(x-1)-(5x-11)(x+1)(x+2)
=2x²-31x-21