若|3x+2y-4|与(5x+7y-3)的平方互为相反数,则x,y的值为（ ） A x=1 y=-1 B x=2 y=-1 C D 无数组解

计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2) 若｜x-y-5｜与｜2x+3y-15｜互为相反数,则x+y＝? 3x+y+5与2-4y+2x是同类项,求x,y 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) 若(2x+y-4与(3x-5y-12)的绝对值互为相反数,则x+y= 若（2x+y-4)²与|3x-5y-12|互为相反数,则x+y=___ 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 若|3x+2y-4|与6（5x+7y-3）的平方互为相反数,则x y的值是 A X=1 Y=1 B x=2 y=-1 C不存在 关于X,Y的方程组3X+2Y=2m+5与x-y=4m-5的解x,y满足x+2y 已知|2-x|与|x-y+4|互为相反数,求代数式3（x-y）-5（x-y）*2-3（x-y）+（y-x）*2-4(x+y）+3（y-x）的值 已知|2-x|与|x-y+4|互为相反数,求代数式3(x-y)-5(x-y)-3(x-y)+(y-x)-4(x+y)+3(y-x)的值 2x-5+y/3=x+3y/4+7与10(x-y)-4(1-x)/3-y=0 求方程组的解 5/4(x+y)(-x-y)^3*[-4/3(x-y)]*[-3/5(y-x)^2] (3x-4y)(5x-4y)-(7x-8y)(6y-5x) 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= 5x^3y(x-y)^3-10x^4y^3(y-x)^2因式分解 5x^3y(x-y)^3-10x^4y^3(y-x)^2 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于