若3x=6y则x:y=?
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若5x+3y=3x+4y=x+2y+6,则x+y=___
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
若3x=7y,则y分之x= ,x:(x:y)=
若3x=7y,则y比x= ,x:(x+y)=
若根号x-3y+6与绝对值y-5互为相反数,则x+y=?x-y=?
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若全集I={(x,y)|x,y∈R},集合M={(x,y)|(y-3)/(x-2)},N{(x,y)|y=x=1},则(
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
若X+6=Y-X-8=2X-3Y-1,则3X-Y=?
若2X+3Y-1=Y-X-8=X+6则2X+Y=