x(x+2)-(x-1)(x+2)=3(x+2)(x-x+1)=3x+2=3x=1先进行因式分解。化简方程式,再求出未知数即可。
x(x+2)-(x-1)(x+2)=3x²+2x-x²-2x+x+2=3x²+2x-x²-2x+x=1x=1请采纳
x(x+2)-(x-1)(x+2)=3X^2+2X-x^2-X+2=3X+2=3X=1
x^2+2x-x^2-x+2=3x=1