已知x+y=6,xy=-3,则x2y+xy2=
已知x+y=6,xy=-3,则x2y+xy2=
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______.
已知x+y=-5,xy=7,求x2y+xy2-x-y的值.
已知x+y=10,xy=24,求x3+y3-x2y-xy2的值
已知x+2y=5,xy=1.则2x2y+4xy2=______.
已知x+y=3,xy=1,求代数式①x2y+xy2;②x2+y2的值.
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是正整数,且xy+x+y=23,x2y+xy2=120,求x,
已知A=8x2y-6xy2-3xy,B=7xy2-2xy+5x2y,若A+B-3C=0,求C-A.
已知实数x、y满足x+y+xy=9,x2y+xy2=20,求x2+y2的值.