若X/Y=7/5,则Y-X/X+3Y=

若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝ 若3x=5y,则x:y=________,(x-y):y=______ 若X/Y=7/5,则Y-X/X+3Y= （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 若3x=7y,则y比x= ,x:（x+y）= 若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) 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 若x,y为正整数,且满足3x(x+y)-y(x+y)=7,求x,y (5)若x/2=y/3(y不为0）则x/y=____,x+y/y=___,y/x-y=___. 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 若2x=3y,则(x*x+y*y)/x*x=? 若x-y=3,则-x+5+y=( ) 若x:y=3则x:(x+y)= 若5x+3y=3x+4y=x+2y+6,则x+y=___ 若3x+7y=4y+5,则x+y=