已知x+5y=6,则x2+5xy+30y=______.
已知x+y=-5,xy=6,则x2+y2=______.
已知x+y=5,xy=3 则x2+y2=______.
已知x+y=4,xy=2,则x2+y2+3xy=______.
若x+y=5,xy=6,则x2+y2=______.
已知:3x+y=5,x+3y=-1,则3x2+6xy+3y2的值为______.
已知x+y=17,xy=60,则x2+y2=______.
已知实数x、y满足x2+4xy+4y2+x+2y-6=0,则x+2y的值为______.
实数x,y满足x≥y≥1和2x2-xy-5x+y+4=0,则x+y=______.
已知xy=3,x2+xy-2y2=2(x+2y),且x≠-2y,则x+y=______.
已知x-y=5,xy=3,则3xy-7x+7y=______.
已知x,y都是正实数,且x+y-3xy+5=0,则xy的最小值______.
已知xy=-3,x+y=-4,则x2+3xy+y2值为______.