已知x/3y=y/2x-5y=6x-5y/x,则4x²-5xy+6y²/x²-2xy+3y²的值是多少?（最好有解题过程

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知x,y满足约束条件 2x+5y>=10 2x-3y>=-6 2x+y 已知x,y满足约束条件{2x+5y>=10,2x-3y>=-6,2x+y 已知实数x,y满足2x+5y>=10;2x-3y>-6;2x+y x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy) 1、(-y^3)^5/y^3/ y^2+2(-y)^102、(x-y)^7/(y-x)^6+(x+y)^3/(x+y)^23、已知X^a=5,x^b=3,求X^(3a-2b)的值 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值. （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) 已知：4x = 5y,求(x+y) ：y 已知5/x=3/y,求x+y/x+x-y/y-x^2-y^2/y^2的值 已知x/5=y/3,求x+y分之x+x-y分之y减y^2/x^2-y^2的值 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值