已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值
已知x²+4x+y²-10y+29=0 求【x+2y】÷【x²-2y²】的值
已知x²+y²-4x+6y+13=0,求x²+2y/x²-3y²的值
2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y
已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值
已知4x²-3y²=7,3y²+2y²=19,求14x²-2y的值
已知:x²+4x+y²-+6y+13=0,求x-2y/x²+y²的值.
已知x²y²+x²+y²=10xy-16 求x,y
已知:x²+y²+4x+6y+13=0 求:x²+y²的值
1.已知x²-10x+y²+4y+29=0,求x²+y²值.
已知X²-2X+4Y²-12Y+10=0,求3X²-2Y²的值