解方程x²-2xy+y²=9,x²+4xy+4y²+x+2y=2 2x-1/y=
解方程x²-2xy+y²=9,x²+4xy+4y²+x+2y=2 2x-1/y=
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
解方程x四方-x²+2xy+y²+1=0 x²+2xy+6x+2y²+4y+10
解方程:x²+2xy+6x+2y²+4y+10=0
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
2x+y=0,求4x²+2xy(x+y)+y³
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/(x+2y-12Y²/x-2y)的值
若|x-2|+x²+1/4y²-xy=0 x= y=
X²+2xy+y²/xy乘x²-2xy+y²/xy+y²=
已知实数x,y满足5x²+2y²+1=6xy+4x-2y,则x²-xy+2000y