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数学教科书的解决方案/纯数学 1/第 3 章
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数学教科书的解决方案
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纯数学 1
等差数列的第四项为 10，它的第十一项比其第四项的三倍大 1，求该数列前 20 项的和。
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书籍：数学教科书的解决方案
华夏公益教科书
