已知/x+2/+/y-3/=0,求-2.5x-5/3y+4xy的值

已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知2x+3y=0,求代数式1.5x+4y/3x-2y 2.x²+xy-y²/x²-xy+y² 已知x+y=0,求x^3+x^2*y+xy^2+y^3 已知|2x-3y|+|3x-y-1|=0,求x,y的值. 已知4x-2y=0,求x-y/3x+2y的值 已知(x+y)^(2)+(x+3y-4)^(2)=0,求x,y的平方和 已知x=2y,求2x-y分之x-3y的值.0 已知2x²-xy-3y²=0,求x-y/x+y 已知|x+y|+(x-y+3)^2=0,求x,y的值 已知x,y>0 2x+y+3=xy 求5x+4y最小值 已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y) 已知x,y属于R+,且2x+8y-xy=0,求x+y的最小值.2.已知x,y属于R+,且x+2y=3,求[1/(x+2)]+[1/2(y+1)]的最小值 已知|x-y+3|+(2x+y)^2=0,求4x+3y的值 已知|x-y+3|+(2x+y)^2=0,求4x+3y的值1.已知|x-y-1|+(x+y)^2=0,求2x+3y的值2.已知|x-y+3|+(2x+y)^2=0,求4x+3y的值急 已知x-3y=0,求（2x+y)/(x^2-2xy+y^2)*(x-y)的值已知x-3y=0,求（2x+y)/(x^2-2xy+y^2)*(x-y)的值 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知x^2-3y^2=2xy(x>0,y>0),求代数式x+2y/x-y 已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)*(x-y)的值. 已知x-3y=0,求2x+y/x-2xy+y乘(x-y)的值