摘要:如图所示的三角形数阵叫“莱布尼兹调和三角形 .它是由整数的倒数组成的.第行有 个数.且两端的数均为.每个数是它下一行左右相邻两数的和.如: ..则第行的第个数 为( ) A. B. C. D.
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