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1/2＋1/6＋1/12＋1/20＋1/30＋1/42＋1/56＋1/72＋1/90＝（ ）。
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1/2＋1/6＋1/12＋1/20＋1/30＋1/42＋1/56＋1/72＋1/90＝（ ）。
A、0.1
B、1/8
C、0.9
D、11/12
时间：2022-02-21 19:04
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事业单位
天津
辽宁
广东
河北
答案解析
C
1/2＋1/6＋1/12＋1/20＋1/30＋1/42＋1/56＋1/72＋1/90＝（1－1/2）＋（1/2－1/3）＋（1/3－1/4）＋（1/4－1/5）＋（1/5－1/6）＋（1/6－1/7）＋（1/7－1/8）＋（1/8－1/9）＋（1/9－1/10）＝1－1/10＝0.9。
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