WEBVTT

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现在我们已经看到对 i

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进行幕次越来越高的乘方运算，其结果可能是 1，i，

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－1，－i，然后又回到

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1，i，－1，－i。

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我们现在来做些练习，

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也许就是所谓的难题。

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可能看起来是这样。

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解题时如果你能利用 i 的

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乘方值就在这几个数里循环

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的规律，也是有意思的。

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如果利用这个规律，可以不费力

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就算出 i 的 任意高的次方。

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现在我们先来试一下，

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计算 i 的 100 次方。

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这里关键是 100 是 4 的倍数。

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因此可以说这等同于 i 的

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4 乘以 25 次方。

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而根据指数乘方的性质，它也

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就是 i 的 4 次方的结果的 25 次方。

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