求满足x²+y²=2(x+y)+xy的所有正整数x、y.
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.
已知实数x,y满足x²+4y²=4.求f(x,y)=x²+2xy+4y²+x+2
.已知xy=8满足x²y-xy²-x+y=56,求x²+y²的值 2.若x-3=
|x+2y+3|+(2x+y)²=0求x²-xy+y²
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
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/x²-2xy+y²