已知x+y=2,xy=三分之二.求(x²-1)(y²-1)

已知x+y=2,xy=三分之二.求(x²-1)(y²-1) 已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y 已知X²+Y²+X²Y²-4XY+1=0 求:（X-Y)^2008-(XY)^2 已知x+y=2,xy=1/2,求x³y+2x²y²+xy³ 已知x+y=1,xy=-二分之一,求x（x+y)(x-y)-x(x+y)² 已知x+y=3 xy=-5 求x设abc=1 求x²+3xy+2y²/x²y+2xy
已知实数xy满足x²﹢y²-xy+2x-y+1=0求xy 已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知(x+2)²+|y+1|=0,求(2x²-xy)-2(x²-y²+xy)+( 已知实数xy,满足10x²-2xy+y²+6x+1=0,求x+y 已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+x(xy+y)的值 已知x-y=1,求代数式1/2(x²+y²)-xy