若X:Y=2:5,且3X+4Y=78,则X=?Y=?
若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值
若5x+3y=3x+4y=x+2y+6,则x+y=___
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
2x+y=3且x-3y=5,则y(x-3y)^2+2x(3y-x)^2=?
2x+y=3且x-3y=5,则y(x-3y)^2+2x(3y-x)=?
若x/y=4/3 则3x+2y/2x-5y=
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若X,Y互为相反数,且(X+Y+3)(X-Y-2)=0,求X,Y的值?
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
如果x/y=2/3且x不等于2,则x-y+1/x+y-5的值