A.13
B.26
C.33
D.36
更新1:
then x+y+z=?
Maths~!!
回答 (2)
2009-08-20 7:07 am
✔ 最佳答案
What is A.S.?2009-08-19 23:03:05 補充：
Are you asking x + y + z?
2009-08-19 23:07:38 補充：
25 - (-1) = 4d
4d = 26
d = 6.5
x = -1 + 6.5 = 5.5
y = 5.5 + 6.5 = 12
z = 12 + 6.5 = 18.5
x + y + z = 5.5 + 12 + 18.5 = 36(D)
2009-08-20 7:03 am
等差級數
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https://hk.answers.yahoo.com/question/index?qid=20090819000051KK02547