观察下列一列数,按某种规律在横线上填上适当的数字:1/3 3/5 5/7 7/9 9/11 .,问第n个数为______.
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![观察下列一列数,按某种规律在横线上填上适当的数字:1/3 3/5 5/7 7/9 9/11 .,问第n个数为______.](/uploads/image/z/1615989-21-9.jpg?t=%E8%A7%82%E5%AF%9F%E4%B8%8B%E5%88%97%E4%B8%80%E5%88%97%E6%95%B0%2C%E6%8C%89%E6%9F%90%E7%A7%8D%E8%A7%84%E5%BE%8B%E5%9C%A8%E6%A8%AA%E7%BA%BF%E4%B8%8A%E5%A1%AB%E4%B8%8A%E9%80%82%E5%BD%93%E7%9A%84%E6%95%B0%E5%AD%97%3A1%2F3+3%2F5+5%2F7+7%2F9+9%2F11+.%2C%E9%97%AE%E7%AC%ACn%E4%B8%AA%E6%95%B0%E4%B8%BA______.)
观察下列一列数,按某种规律在横线上填上适当的数字:1/3 3/5 5/7 7/9 9/11 .,问第n个数为______.
观察下列一列数,按某种规律在横线上填上适当的数字:1/3 3/5 5/7 7/9 9/11 .,问第n个数为______.
观察下列一列数,按某种规律在横线上填上适当的数字:1/3 3/5 5/7 7/9 9/11 .,问第n个数为______.
2n-1/2n+1
2n-1/2n+1
(2n-1)/(2n+1)