Question

这个这道题该怎么做？

这道题该怎么做呀？在线等，急

Answer 1

1：four fifty a quarter four
2: five thirty half past five
3: a quarter to ten nine fourtyfive
4: seven fifty five seven point five five to eight (3选1)
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Answer 2

显然该数列为等比数列！
只有 |q|<1才可能收敛！ 同时其和为： a1/(1-q)=q/(1-q)=2， q=2/3
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级数∑An≠0 是否可以得出这个级数∑An是收敛的？
你说想说liman≠0吧!
liman≠0, 则级数∑an必定发散！
liman=0,则级数∑an不一定收敛！

Answer 3

你不会等到答案的，你这拍的啥也看不清

Answer 4

1：four fifty a quarter four 2: five thirty half past five 3: a quarter to ten nine fourtyfive 4: seven fifty five seven point five five to eight (3选1)