若2x—3y=-3,则5-2x+3y=?

若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) 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 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=? (5)若x/2=y/3(y不为0）则x/y=____,x+y/y=___,y/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=4/3 则3x+2y/2x-5y= 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|+(x-y-5)^2=0,则x)^2-y^2= 若x、y互为相反数,且2x-3y=5,则x+y=? x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 (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 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27