![[從零到奧數] #25 一位女士將 4500 元的一部分以 4% 的利率投資，其餘的以 6% 的利率投資。 如果她每項投資的年回報率相同，那麼她實現的 4500 元的平均利率是多少？](https://1a-1791.com/video/s8/1/0/D/U/8/0DU8e.qR4e-small--25-4500-4-6-4500-.jpg)
[從零到奧數] #25 一位女士將 4500 元的一部分以 4% 的利率投資，其餘的以 6% 的利率投資。 如果她每項投資的年回報率相同，那麼她實現的 4500 元的平均利率是多少？
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