已知-x+2y=6,则3(x-2y)²-5(2y-x)+6=
已知2x²+3y²=6x 则x²+y²+2x的最大值
已知xy=-2,x-y=3,求(x+y)(x-y)-y²+(x-y)²-(6x²y-2xy
已知x/3y=y/2x-5y=6x-5y/x,则4x²-5xy+6y²/x²-2xy+3y
已知x²+y²-4x+6y+13=0,求x²+2y/x²-3y²的值
已知实数x,y满足3x²+2y²=6x,则x²+y²的最大值是_______
已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值
已知x²+y²-6x+4y+13=0,求(2x-y)²-2(2x-y)(x+2y)+(x+
已知4x²+y²-4x-6y+10=0,求(2x/3*√(9x)+y²√(x/y³
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
已知关于x、y的方程组3(x²+y²)-5xy=6;2(x²+y²)+xy=17
已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/x
已知圆x²+y²+x-6y+m=0与直线x+2y-3=0