Example：
Write down an arithmetic sequence which contains 1 and 5. Clarify your answer.
Solution：
+4 +4
1, －＞ 5, －＞ 9
So,the arithmetic sequence is 1，5，9.
Question：
Write down an geometric sequence which contains 50 and -25.Clarify your answer.
Solution：???
幫幫忙，中一級數學數題(scquence)
2009-11-22 8:58 pm
回答 (2)
2009-11-22 9:17 pm
✔ 最佳答案
Write down an geometric sequence which contains 50 and -25.Clarify your answer.Solution：
(-25/50 = - 1/2)
x (-1/2) , x (-1/2)
50, 一 > - 25, 一> - 25 x (-1/2)
50, 一 > - 25, 一> 25/2
So,the geometric sequence is 50 , - 25 , 25/2
2009-11-22 10:46 pm
50 / -25 = -2
if term 1 is -25, then the next term can be -25 * 2 = 50. Then, we can get 50 and -25, the third term is 50*-2 = -100
so the ans.:
-25, 50, -100
if term 1 is -25, then the next term can be -25 * 2 = 50. Then, we can get 50 and -25, the third term is 50*-2 = -100
so the ans.:
-25, 50, -100
參考: me
收錄日期: 2021-04-21 22:04:29
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