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數學教科書的解決方案/純數學 1/第 3 章
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數學教科書的解決方案
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純數學 1
等差數列的第四項為 10，它的第十一項比其第四項的三倍大 1，求該數列前 20 項的和。
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書籍：數學教科書的解決方案
華夏公益教科書
