x²-2xy+y²-2x+2y+1
x²-2xy+y²-2x+2y+1
1、已知实数x、x满足x²+y²-xy+2x-y+1=0,试求x、y的值.
3y/2x+2y+2xy/x²+xy 2x/x²-64y²-1/x-8y (1/a+1/b
(3x+2y)(9x²-6xy+4y²﹚
因式分解:xy³-2x²y²+x³y
已知x²-xy=4,y²-xy=9求下面代数式的值(1)x²-2xy+y²;(2
已知x=3 y=1\3,求3x²y-[2xy²-2﹙xy-3\2x²y﹚+xy]+3xy&
1.若x/y=2,求分式x²-xy+3y²/x²+xy+6y²的值
已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值
[xy(x²-3y)+3xy²]﹙﹣2xy﹚+x³y²﹙2x-y﹚ 其中x=﹣1
分解因式 8(x²-2y²)-x(7x+y)+xy
已知xy是实数,且(x+y-1)²与根号2x-y+4互为相反数,求实数y的x次方