已知﹙2x+y﹚²=18,2x-y=6,则4x²+y²=_____,xy=___
已知﹙2x+y﹚²=18,2x-y=6,则4x²+y²=_____,xy=___
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知实数x,y满足5x²+2y²+1=6xy+4x-2y,则x²-xy+2000y
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
整式的乘法与因式分解已知,x²-3xy+2y²=0(xy≠0),则x/y+y/x=___(由于不好打
已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4
设实数x,y满足x²+1/2y²4-xy+2y=0.则x=___,y=___
已知X/Y=2,则X²+2XY-3Y²/X²-XY+Y²=?
已知x/y=2,求x²-xy+3y²/x²+xy+6y²的值
已知X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
若2x=-y,则分式(xy)/(x²-y²)=_____