x-2y+3=0那么2x²-8xy+8y²
|x+2y+3|+(2x+y)²=0求x²-xy+y²
若X²+3XY-2Y²=0,那么X/y=?
已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值
若x/y=2,求7x²-3xy+2y²/2x²-3xy+7y²的值 答案是8/3
已知xy≠0,且3x²-2xy-8y²=0,求x/y的值
已知x/y=3,求x²+2xy-3y²/x²-2xy+y²
已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值
x/y=2,求分式x²-xy+3y²/x²+xy+6y²
一道方程组(要过程)X²+3XY+Y²+2Y=8 2X²+2Y²+3X+3Y=1
已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/x
已知2x²+xy=10,3y²+2xy=6,求4x²+8xy+9y²的值
已知2x²+xy=10,3y²+2xy=6,求4x²+8xy+y²的值