已知x²0-6x+|y-1|=2x-16则x\x²+xy+y²=多少
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)²
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知实数xy,满足10x²-2xy+y²+6x+1=0,求x+y
已知实数x,y满足5x²+2y²+1=6xy+4x-2y,则x²-xy+2000y
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
已知x²-5xy+6y²=0,那么x+y分之x-y等于多少
已知x+y=-5,xy=6,则x²+y²=多少
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
已知xy都是正实数且满足4x²+4xy+y²+2x+y-6=0则x(1-y)的最小值