2018-10-10 22:03:03 +00:00
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id: 5900f4571000cf542c50ff6a
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2020-12-16 07:37:30 +00:00
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title: 问题235：算术几何序列
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2018-10-10 22:03:03 +00:00
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challengeType: 5
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videoUrl: ''
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---
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2020-12-16 07:37:30 +00:00
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# --description--
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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给定是算术几何序列u（k）=（900-3k）rk-1。设s（n）=Σk= 1 ... nu（k）。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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找到r的值，其中s（5000）= - 600,000,000,000。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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将您的答案四舍五入到小数点后面的12位。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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# --hints--
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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`euler235()`应该返回1.002322108633。
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2018-10-10 22:03:03 +00:00
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```js
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2020-12-16 07:37:30 +00:00
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assert.strictEqual(euler235(), 1.002322108633);
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2018-10-10 22:03:03 +00:00
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```
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2020-12-16 07:37:30 +00:00
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# --solutions--
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2020-08-13 15:24:35 +00:00
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