C
caoson2000


a,X mu 3 + 3x mu 3 + 3x +1
b. m mu 3- 3m mu 2 + 3m -1
c,x mu 2+(a+b) .xy + ab y mu 2
d,ab(x mu 2+ y mu 2)+ xy (a mu 2 + b mu 2)
b. m mu 3- 3m mu 2 + 3m -1
c,x mu 2+(a+b) .xy + ab y mu 2
d,ab(x mu 2+ y mu 2)+ xy (a mu 2 + b mu 2)