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二 项 式 定 理
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二 项 式 定 理. 浙江省温州中学 金荣生. 1 、 这条式子在生活中有用吗?. 2 、 不用计算器,它的值大致是多少?. 让我们一起来研究 的展开式. 二项式系数. 1、系数规律. (1)各项的次数均为 n; (2) 字母 a 的次数由 n 降到0, 字母 b 的次数由0升到 n. 2、指数规律. 3、项数规律. T r+1 =. 二项展开式共有 n+1 项. 4、通项公式. 的值大致是多少?. 例 1 .展开. .. 例 2 .展开. 例 3 .求. 的展开式中的.
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二 项 式 定 理
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