分解因式：①x^2+3y-xy-3x②x^3+2x^2y-9x-18y③(y+2)x^2+(y+2)x-12y-24④m平方x平方_数学解答

分解因式：①x^2+3y-xy-3x②x^3+2x^2y-9x-18y③(y+2)x^2+(y+2)x-12y-24
④m平方x平方+n平方y平方-n平方x平方

人气：144 ℃　时间：2020-06-24 20:35:38

解答

①x^2+3y-xy-3x=x(x-y)-3(x-y)=(x-y)(x-3)②x^3+2x^2y-9x-18y=x²(x+2y)-9(x+2y)=(x+2y)(x²-9)=(x+2y)(x-3)(x+3)③(y+2)x^2+(y+2)x-12y-24 =(y+2)x²+(y+2)x-12(y+2)=(y+2)(x²+x-12)=(y+2)(x+4)(x...