已知x+y=a,xy=b,则xy2+yx2=______.
已知x+y=6,xy=4,则x2y+xy2的值为______.
已知x+2y=5,xy=1.则2x2y+4xy2=______.
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是正整数,并且xy+x+y=23,x2y+xy2=120,则x2+y2=______.
已知x+y=-5,xy=7,求x2y+xy2-x-y的值.
若实数x,y满足xy+x+y+7=0,3x+3y=9+2xy,则x2y+xy2=______.
已知x、y均为实数,且满足xy+x+y=17,x2y+xy2=66,则x4+x3y+x2y2+xy3+y4=______
已知A=8x2y-6xy2-3xy,B=7xy2-2xy+5x2y,若A+B-3C=0,求C-A.
已知x+y=6,xy=-3,则x2y+xy2=
如果x+y=0,xy=-7,x2y+xy2=______,x2+y2=______.
已知(x+1)2+|y-1|=0,求2(xy-5xy2)-(3xy2-xy)的值.