(x+2)^2+(2x+1)(2x-1)-4x(x+1)
问题描述:
(x+2)^2+(2x+1)(2x-1)-4x(x+1)
答
(x+2)^2+(2x+1)(2x-1)-4x(x+1) =x+2x+4+4x-1-4x-4x =x-2x+3 =(x-1)+2
(x+2)^2+(2x+1)(2x-1)-4x(x+1)
(x+2)^2+(2x+1)(2x-1)-4x(x+1) =x+2x+4+4x-1-4x-4x =x-2x+3 =(x-1)+2