求xy'-y-[（x²+y²）的二分之一次方]=0的通解

已知x²y²+x²+y²=10xy-16 求x,y 若x² +xy+y² =14,x² -xy+y²=28求x+y的值 x/y=2,求分式x²-xy+3y²/x²+xy+6y² x/y=2,求x²-3xy+y²/2x²-3xy+5y² 若x²+xy+y²=14,x²-xy+y²=28,求x+y的值 已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值 已知x/y=3,求x²+2xy-3y²/x²-2xy+y² 已知：x²+xy=3,xy+y²=-2 求：2x²-xy-3y² 已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² 已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² + xY- 2Y² =求x² - 4x Y+ Y² = 6x²-xy-15y²=0 求x²-2xy+4y²/2x²-3xy-3y²告诉下 6x²-xy-15y²=0 求2x²-3xy-3y²分之x²-2xy+4y² 谢谢高手解答x²-xy=2,-xy+y²=5求x²-2xy+ y²,x²- y² 若1/x+1/y=3,则2x-xy+2y/x-2xy+y的值是多少?还有已知x/y=2/7,求x²-3xy+2y²/2x²-3xy+2y&s后面这个应该是已知x/y=2/7，求x²-3xy+2y²/2x²-3xy+2y² 已知2x+3y=0,求代数式1.5x+4y/3x-2y 2.x²+xy-y²/x²-xy+y² 已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/xy的值 X²-Y²=2XY,求(X-Y)÷(X+Y) 已知xy=8满足x²y-8xy²-x+y=56,求x²+y²的值-8xy² 已知x³-xy=8,xy-y²=-3求x²-y²,x²-2xy+y²的值