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65. Phân tích đa thức thành nhân tử
a) ab(a+b)- bc(b-c) + ac(a-c)
b) a(b^2+c^2)+ b(c^2+a^2)+ c(a^2+^2)+ 2abc
c) (a+b)(a^2-b^2)+ (b+c)(b^2-c^2)+ (c+a)(c^2-a^2)
d) a^3(b-c)+ b^3(c-a)+ c^3(a-b)
e) a^3(c-b^2)+ b^3(a-c^2)+ c^3(b-a^2)+ abc(abc-1)
a) ab(a+b)- bc(b-c) + ac(a-c)
b) a(b^2+c^2)+ b(c^2+a^2)+ c(a^2+^2)+ 2abc
c) (a+b)(a^2-b^2)+ (b+c)(b^2-c^2)+ (c+a)(c^2-a^2)
d) a^3(b-c)+ b^3(c-a)+ c^3(a-b)
e) a^3(c-b^2)+ b^3(a-c^2)+ c^3(b-a^2)+ abc(abc-1)