等差數列求和 | Summation of an Arithmetic Sequence

影片內容:

00:05 – 數列的和 | summation of a sequence
02:17 – 等差數列求和公式 | derivation of the summation formula of arithmetic sequence
09:03 – 例子 1 | example 1
10:53 – 例子 2 | example 2
14:05 – 例子 3 | example 3

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