若x:y=3则x:(x+y)=

若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 若2x=3y,则(x*x+y*y)/x*x=? 若x:y=3则x:(x+y)= 若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝ 若3x=7y,则y比x= ,x:（x+y）= 若3x=5y,则x:y=________,(x-y):y=______ 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 若x+y=3 x²-y² 则x-y=?若x+y=3 x²-y²=24 则x-y=? 比例线段若x+y/x-y=4/3,则x/y=x+y/x-y=4/3,则x/y=要快~~ 若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) 若x+y=4,则多项式1/2(x+y)+4(x-y)-3（x-y）-3/2(x+y)-x+y值是（） 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 若f(x+y,y/x)=x^2-y^2,则F(X,Y)= 已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy) 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 （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