若(2x-2y)^2+|5x-7y-2|=0,则x+2y的值为?急,

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 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 化简:3(x-y)²-7(x-y)+ 2(x-y)²+5(x-y) 化简y(x+y)+(x+y)(x-y)-x^2 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*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 化简3(x-y)-7(x--y)+2(y-x) 5x(x-y)+2y(x-y) 化简:5(x-y)+2(x+y)-3(x-y) 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 因式分解x(x+y)(x-y)-x(x+y)^2 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) （X+2Y)(5X-2Y) (x+2y)(5x-2y) 若5x+y/7x+10y=1/2,则x/y=?