已知(x+2)²+│y-1│=0,求7x²y-3+2xy²-6x²y-2xy
已知(x+2)²+│y-1│=0,求7x²y-3+2xy²-6x²y-2xy
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值
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
已知实数xy,满足10x²-2xy+y²+6x+1=0,求x+y
已知x²-7xy+12y²=0求x²-xy+y²/2xy的值
已知实数xy满足x²﹢y²-xy+2x-y+1=0求xy
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)