已知实数x,y满足(x+y)²=1,(x-y)²=25,求x²+y²+xy的值
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知实数x、y满足x²﹢y²-xy+2x-y+1=0,试求x、y的值
已知实数x、y满足x²y+xy²=20,xy+x+y=9,求x²+y²的值.
已知实数x、y满足(x+1)²+(|2y|-1)²=0,求xy的值
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
已知实数x、y满足x²+y²-xy+2x-y+z=0,试求x、y的值
已知实数x,y满足2x²+6xy+9y²-2x+1=0,试求x,y的值.
已知实数xy,满足10x²-2xy+y²+6x+1=0,求x+y
已知实数xy满足x²﹢y²-xy+2x-y+1=0求xy
已知实数xy满足(x-2)²+(y-2)²=1 求y/x的最值 求(y+x)的最值
已知实数x,y,xy=5,x+y=7,求代数式x²y+xy²的值
已知实数x,y,z,满足x+y=5,z²=xy+y=9,求x+2y+3Z的值