(7x-6y)^2+2(7x+6y)(7x-6y)+(7x+6y)^2,其中x=1/14

3(x-y)^2-7(x-y)+8(y-x)^2+6(y-x)合并同类项. 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 计算：(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2 2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方 计算(x-y)^7÷(y-x)^6+9-x-y)^3÷(x+y)^2 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) 已知：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) -6x-y-7x+6x-2y-10x+8y+x+6x-8y的值 -8(2x-y)-{7x-[6x+2y-(10x-8y)]}等于多少? 3x+5y-(x+y)=6 2(x+y)-3x=-7 将(x-y)看成一个整体,将3(x-y)²-4(x-y)+7(x-y)-6(y-x)²-2(y-x)合并同类项. 把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²= x^2-xy-2y^2+x+7y-6 因式分解：5(x-y)^2+7(x-y)-6 5(x-y)^2-7(x-y)-6因式分解 x²+xy-2y²-x+7y-6 若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值