x²+7x+10 x²-2x-8 y²-7y+12 x²+7x-18

x²+7x+10 x²-2x-8 y²-7y+12 x²+7x-18 化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)² 因式分解：(x-y)(3x-7y)²-4(x-y)(x+y)² 因式分解:x²(x-y)+(y-x) 化简下列各式,并求值:3(x-y)²-7(x-y)+8(x-y)²+6(x-y) 其中x=2,y 1/x²×x³+x的7次方÷x² 2/、【（x-y)²+（x+y)(x-y)]÷ -6x-y-7x+6x-2y-10x+8y+x+6x-8y的值 (2x-y)²-4(x-y)(x+2y) 化简：（2x-y)²-4(x-y)(x+y) 分解因式：8（x²-2y²）-x（7x+y）+xy 分解因式8（x²-2y²）-x（7x+y）+xy= 8(x²-2y²)-x(7x+y)+xy分解因式