已知|2X+3Y-1|+(3X+2Y-2)²=0,则X+Y=?
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
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+2|+(2x-3y-1)²=0 求 ⑴x、y的值 ⑵2x³-x²-3y
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
已知x+y+2(-x-y+1)=3(1-y-x)-4(y+x-1),则x+y等于( )
已知x-5y=0(y≠0),则代数式2x-3y/3x+6y
已知2x+3y=2(x>0,y>0),求x+y最大值
已知y-2x=0,求3x²-2y²/(x+y)(x-y)的值
已知|2x-3y|+|3x-y-1|=0,求x,y的值.
已知x-y-3绝对值+(2x+2y+10)的平方=0,则(x+y)(x-Y)=
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(