实数x,y满足x乘以1-x=y-2 + x-1.求3x²+xy-y²除以x²-xy+y
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
若实数x,y满足x根号(1-x)=根号(y-2)+根号(x-1),求3x²+xy-y²/x²
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
实数x y满足x≥y≥1和2x²-xy-5x+y+4=0求x+y之值
(xy-x²)除以xy分之x²-2xy+y²乘以x²分之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满足条件|2x+3y+1|+(x+3y+5)²=0,求式子(-2xy)²×(-y
已知实数x,y满足5x²+2y²+1=6xy+4x-2y,则x²-xy+2000y
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均为实数,且满足XY+x+y=17,xy²+x²y=66,求x²+y²