Common diffrence is 4/12,the next number is 15/12 + 4/12 = 19/12 .
3/12,7/12,11/12,15/12 arithmetic progression.
所有跟帖:
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謝謝
-breehm-
♀
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12/16/2016 postreply
11:54:44
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不用謝,有題盡管問.
-jinjing-
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12/20/2016 postreply
15:49:10
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另一種算法得數也是19/12, 雖然笨了些,卻發現了個有趣的規律-----
-dream_pillow-
♂
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01/10/2017 postreply
19:43:59