正整数x与y满足x²-y²=24,求xy(x+ y)的值
.已知xy=8满足x²y-xy²-x+y=56,求x²+y²的值 2.若x-3=
若x² +xy+y² =14,x² -xy+y²=28求x+y的值
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xy=8满足x²y-xy²-x+y=56,求x²+y²
已知,整数x、y满足x²+xy+2y²=7,求x、y的值.
x²+y²+4x-8y+20=0,求分式x²-y²/xy的值
已知x/y=3,求x²+2xy-3y²/x²-xy+y³的值
已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值
已知x²y²+x²+y²=10xy-16 求x,y
已知x+y=-3 求(2x²+xy+3y²)-(x²-xy+2y²)的值
已知x/y=2,求(x²-xy+3y²)/(x²+xy+6y²)的值