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解: 求数列通项 1, 4, 7, 10, 13 — Detailed Solution | AhaStep

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📐 MathLevel 2 — 🟢 Basicsequence_finder👁 19 views⏱ 1 min read

解: 求数列通项 1, 4, 7, 10, 13

📝 Problem

求数列通项 1, 4, 7, 10, 13

✨Detailed Solution

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1. 📝 给定数列: 1, 4, 7, 10, 13, ...

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2. 🔍 识别: 等差数列公差 d = 3

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3. 📐 通项公式: u_n = u₁ + (n-1)·d = 1 + (n-1)·3

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4. ✨ 化简: 3n -$ 2$

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Giải: tìm công thức dãy 7, 10, 13, 16, 19