2022-2023英语周报七年级新目标第34答案

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16.B【解析】由题意知,杨辉三角前9行共有1+2+3+4+5+6+7+8+9=45项,故前47项的和为杨辉三角前9行的和再加第10行的前两个数1和9.所以前4项的和S:2=2+21+22+…+28+1+9=521故选B.

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