1-x²-4y²-4xy
x²+xy/(x-4y)(x+y),其中x=4,y=-1
已知X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
【分解因式】 x²-xy+4分之1y² x²y-2xy²+y³ a(x
因式分解:4x²y+4xy²+xy²
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
因式分解:x²-y²+4xy
4x²y-1/2{x²y-[5x²y-2(2xy²+1/4xy)]}+3xy
已知x²-3xy+4x=3,y²+xy-4y+7=0,则xy-1/2(x²+y²
(-x-2y)(x²-2xy+4y²)