已知|x-1|+|y+3|=0,则2x+y=
已知|2x-3y|+|3x-y-1|=0,求x,y的值.
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
已知x-y-3绝对值+(2x+2y+10)的平方=0,则(x+y)(x-Y)=
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x,y满足约束条件:x-y+1>=0,x+y-2>=0,x
已知|2x-1+3y|+|3x+6-2y|=0则x+y=
已知(x+y+2)2+|2x-3y-1|=0,则x+y=______.
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知x,y满足-5|x-2y|+8|y-1\2|=0则x=( ),y=( )
已知x-5y=0(y≠0),则代数式2x-3y/3x+6y