已知│2x-y-3│+(2x+y+11)×(2x+y+11)=0,则x=? y=?

已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 已知x+y/y=11/8,求x-y/x+2y的值. 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 已知x+y/x=11/8,求x-y/x+2y的值 已知x-y-3绝对值+(2x+2y+10)的平方=0,则(x+y)(x-Y)= 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y) 已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)} 数学题已知p=x^/x-y-y^/x-y,q=(x+y)^-2Y(X+Y), 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于