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[obm-l] Fatoração
1) (a-b)c^3 - (a-c)b^3 + (b-c)a^3
2) a^4 - 2a^3b - 8a^2b^2 - 6ab^3 - b^4
3) a^3(a^2 - 7)^2 - 36a
4) a+b+c = 0 -> (a^5 + b^5 + c^5)/5 = (a^3 + b^3 + c^3)/3 . (a^2 + b^2 + c^2)/2
5) Prove that if a/(b-c) + b/(c-a) + c/(a-b) = 0, where a<>b, a<>c, b<>c, then
a/(b-c)^2 + b/(c-a)^2 + c/(a-b)^2 = 0
Obrigada,
Daniele.
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