1/3,2/8,3/15,4/24,5/35,6/48,.,根据规律可知第n个数应是?
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![1/3,2/8,3/15,4/24,5/35,6/48,.,根据规律可知第n个数应是?](/uploads/image/z/114714-18-4.jpg?t=1%2F3%2C2%2F8%2C3%2F15%2C4%2F24%2C5%2F35%2C6%2F48%2C.%2C%E6%A0%B9%E6%8D%AE%E8%A7%84%E5%BE%8B%E5%8F%AF%E7%9F%A5%E7%AC%ACn%E4%B8%AA%E6%95%B0%E5%BA%94%E6%98%AF%3F)
1/3,2/8,3/15,4/24,5/35,6/48,.,根据规律可知第n个数应是?
1/3,2/8,3/15,4/24,5/35,6/48,.,根据规律可知第n个数应是?
1/3,2/8,3/15,4/24,5/35,6/48,.,根据规律可知第n个数应是?
数列的通项为 an = n/[n(n+2)] = 1/(n+2)
∴,第n个数为 n/[n(n+2)] ,约分后等于 1/(n+2)