若(2y-x)/(7x+5y)=2/3,且y≠0,则x/y的值等于

若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 3x+5y-(x+y)=6 2(x+y)-3x=-7 若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x 若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y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2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²= x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 化简:3(x-y)²-7(x-y)+ 2(x-y)²+5(x-y) (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11