3x-5y=0,则x-2y/x+3y的值是多少?

3x-5y=0,则x-2y/x+3y的值是多少? 若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是（）?(10x-11y)/(x-y) =[(8x-8y)+(2x-3y)]/(x-y) =8为什么8X-8Y=8？(10x-11y)/(x-y)=[(8x-8y)+(2x-3y)]/(x-y)=8+(2x-3y)]/(x-y)=8+0=8 2y-x/7x+5y=2/3 且y不等于0 则x/y的值为? 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 (x+y-5)+|3y-2x+10|=0,求 x,y的值 （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知|3x-y|+|x+y|=0,求x-y除以x*y的值. y=3(x-y),x=2(x-y)求x,y的值 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值 x+2y分之x-y=3,则代数式,x+2y分之2（x-y)-3(x-y)分之x+2y的值为 若x+2y分之x-y=3,则代数式x+2y分之2（x-y)-3(x-y)分之x+2y的值为 若x+y分之x-y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值 若x-y分之x+y=3,求式子x+y分之5(x-y)—2（x-y）分之x+y的值 若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) 已知方程组{（x+y)-3(x-y)=7 {2(x+y)+(x-y)=0 则x的平方-y的平方的值为写出理由，