Cho dãy số: 2, 4, 6, 8,... Số tiếp theo là?, 9, 10, 11, 12, Cho dãy số: 5, 10, 15,... Số tiếp theo là?, 20, 25, 21, 30, Cho dãy số: 7, 9, 11,... Số thứ 4 là?, 12, 13, 20, 30, Cho csn có u₁ = 2, công bội q = -3. Số hạng thứ 4 là:, 162, 54, -54, -18, Tìm công bội q của csn có u₁ = 5 và u₃ = 45, ± 3, 3, ± 9, 9.
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