若x-2y=-3则5-x+2y=?

若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 (5)若x/2=y/3(y不为0）则x/y=____,x+y/y=___,y/x-y=___. 若2x=3y,则(x*x+y*y)/x*x=? 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 若5x+3y=3x+4y=x+2y+6,则x+y=___ 若(3x-2y)/(x+y)=2/3,则3x/5y= 若|x+y-3|+(x-y-5)^2=0,则x)^2-y^2= 若x/y=4/3 则3x+2y/2x-5y= 若x、y互为相反数,且2x-3y=5,则x+y=? x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 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/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值 若x-2y=5,则式子12-x+2y=.以知3x-4y=2x+y则x∶y= 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+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