全是兔子, 一共60只腿,多了20只, 只能是鸡, 10只鸡, 剩下就是5只兔子。
☆ 发自Android 文学城阅览器 4.0.10
全是兔子, 一共60只腿,多了20只, 只能是鸡, 10只鸡, 剩下就是5只兔子。
☆ 发自Android 文学城阅览器 4.0.10
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