Помогите номер 3!!!!!

Question

Помогите номер 3!!!!!

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Answer 1

(a-b)(a²-b²)=(a+b)(a-b)²
a³-ab²-a²b+b³=(a+b)(a²-2ab+b²)
a³-ab²-a²b+b³=a³-2a²b+ab²+a²b-2ab²+b³
a³-ab²-a²b+b³=a³-a²b-ab²+b³