y满足(x²+y²)(x²+y²-1)=2,求x²+y²的值
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
若正数x,y满足x²-y²=2xy,求(x-y)/(x+y)的值
正数x,y满足x²-y²=2xy,求x-y/x+y的值
已知x,y的值满足方程组x+2y=3,x-y=-2,求x/(x-y)²+x²-y²/(x+
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+1=0 求x y
已知x,y满足x(+1)-(x²+2y)=1,求x²+4xy+4y²-2x+4y的值.
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
已知x,y,z满足x+y+2z=1,x²+y²+6z+1.5=0,求x,y,z的值
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x²+y²+2x-2y=0,求x²+y²的最大值 x+y的最小
已知实数X、Y满足X²+4y²+2x-4y+2=0 求X的2y次方+2x的值