若x+y=3,xy=1,则x2+y2=______.
已知x+y=4,xy=2,则x2+y2+3xy=______.
若x-y=1,x2+y2=25,则xy=______.
若x+y=5,xy=6,则x2+y2=______.
若x2+y2=12,xy=4,则x-y=______.
已知x+y=5,xy=3 则x2+y2=______.
已知xy=-3,x+y=-4,则x2+3xy+y2值为______.
若实数x,y满足|xy|=1,则x2+4y2的最小值为______.
已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值
已知x2+xy=5,xy+y2=-1,则x2-y2=______.
已知x+y=17,xy=60,则x2+y2=______.
已知x+y=-5,xy=6,则x2+y2=______.
分解因式2x2-xy-6y2+7x+7y+3=______.