http://i729.photobucket.com/albums/ww291/kaka1307/0597.jpg
ans: B
pls show clear steps.thanks
geometric sequence
2011-11-01 4:02 am
回答 (1)
2011-11-01 5:01 am
✔ 最佳答案
14 5000,8000,9800The areas increase are 3000, 1800So, the total area in the n + 1 th month= 5000 + 3000 + 1800 + ... + 3000 * (0.6^n)= 5000 + 3000(1 - 0.6^n)/(1 - 0.6)Let n-> infinityThe total area in the end= 5000 + 3000 / 0.4= 12500 (B)
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https://hk.answers.yahoo.com/question/index?qid=20111031000051KK00782