6. Яка з наведених формул правильна? A) a³-b3 = (a+b)(a²-ab+b²); B) a3-b3 = (a²+b²)(a-ab+b) ; Б) a3-b3 = (a-b)(a²+ab+b2); г) a3-b3 = (a-b)(a²+2ab+b2)​
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