如果x+y=0,xy=-7,x2y+xy2=______,x2+y2=______.
如果x+y=0,xy=-7,x2y+xy2=______,x2+y2=______.
如果x+y=0,xy=-7,求①x2y+xy2; ②x2+y2.
已知x、y是正整数,并且xy+x+y=23,x2y+xy2=120,则x2+y2=______.
如果2x+y=4,xy=3,那么2x2y+xy2的值为______.
已知x+y=6,xy=4,则x2y+xy2的值为______.
若x+y=5,xy=6,则x2y+xy2的值为______.
若x-y=3,xy=-2,则xy2-x2y的值是______.
若实数x,y满足xy+x+y+7=0,3x+3y=9+2xy,则x2y+xy2=______.
已知(x+3)2+▕x-y+10▏=0求代数式5x2y-【2x2-(3xy-xy2)-3x2】-2xy2-y2的值.
已知x+y=3,xy=1,求代数式①x2y+xy2;②x2+y2的值.
已知实数x、y满足x+y+xy=9,x2y+xy2=20,求x2+y2的值.
已知x、y均为实数,且满足xy+x+y=17,x2y+xy2=66,求x2+y2