已知X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
已知X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知实数xy满足x²﹢y²-xy+2x-y+1=0求xy
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知2x+y=0,求x-2y/x²+xy*(x²-y²)/x²-4xy+4y
已知2x+y=0,求x-2y/x²+xy乘(x²-y²)÷x²-4xy+4y
已知(x+2)²+|y+1|=0,求(2x²-xy)-2(x²-y²+xy)+(
已知x+y=2,xy=1/2,求x³y+2x²y²+xy³
已知实数xy,满足10x²-2xy+y²+6x+1=0,求x+y