若(5x+2y-3)²+|3x+2y-5|=0则2x+y等什么

若(5x+2y-3)²+|3x+2y-5|=0则2x+y等什么 |x+2y+3|+(2x+y)²=0求x²-xy+y² |3x-y+5|+(2x-y+3)²=0 求x=?y=? [(x+2y)²-（x+y)(3x-y)-5y²]÷(2x),其中x,y满足x²+4x+y 若（3X+2Y-1）²+绝对值【3Y-2X-5】=0则X+Y=( ) 已知（x+2）²+|x+y+5|=0,求3x²y+{-2x²y-[-2xy+（x² 已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/x 数学题……555{(3x+y)(3x-y)-(x-5y)(5x-y)-(x-2y)²÷(-4x),x=-2.y 若2x²+3y²-8x+6y+11=0,则x+y的值 已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值 求代数式3x²y+5x-0.5x²y+3.5x²y-2的值,其中x=1/5,y=7 方程2x²+y²-4x+2y+3=0表示什么曲线?