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(1+3+5+7+……+39+41)/(2+4+6+8+……+40+42)
人气:489 ℃ 时间:2020-04-02 01:41:55
解答
(1+3+5+7+……+39+41)/(2+4+6+8+……+40+42)
=[20(1+41)+21]/[20(2+42)+22]
=[20*42+21]/[20*44+22]
=861/902
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