已知:x+y=0.2,x+3y=1,则3x2+12xy+12y2的值为______.
已知:x+y=0.2,x+3y=1,则3x2+12xy+12y2的值为______.
已知:3x+y=5,x+3y=-1,则3x2+6xy+3y2的值为______.
已知x+y=3,x2+y2-3xy=4,则x3y+xy3的值为______.
已知xy=-3,x+y=-4,则x2+3xy+y2值为______.
已知x+y=4,xy=2,则x2+y2+3xy=______.
已知x2+y2=2,x+y=1,则10xy的值为______.
已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
已知实数x、y满足x2+4xy+4y2+x+2y-6=0,则x+2y的值为______.
已知x(x-1)-(x2-y)=-3,求x2+y2-2xy的值
已知x+y=5,xy=3 则x2+y2=______.
已知:x=3,y=-5,x2-2xy+y2/x2-y2的值是