Toán Lớp 6: Cho A = 2 + 22 + 23 + - + 260. Chứng tỏ rằng 15 là ước của A? -

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Toán Lớp 6: Cho A = 2 + 22 + 23 + – + 260. Chứng tỏ rằng 15 là ước của A?