若（5x+2y)²+|3x+2y-6|=0则2x+y=(

若2x²+3y²-8x+6y+11=0,则x+y的值 |x+2y+3|+(2x+y)²=0求x²-xy+y² 已知x²+y²-4x+6y+13=0,求x²+2y/x²-3y²的值 x²-2x+y²+6y+10=0,求—9(x+y)²+(3x-2y)(2y+3x)的值 已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/x 设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y.若x 已知2x²+3y²=6x 则x²+y²+2x的最大值 若x²+y²-2x+6y+10=0,则x的Y次方等于多少 已知xy=-2,x-y=3,求(x+y)(x-y)-y²+(x-y)²-(6x²y-2xy 设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若| |3x-y+5|+(2x-y+3)²=0 求x=?y=? 已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值