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观察下面三行数:-3.9.-27.81.-243.-5.7.-29.79.-245.
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观察下面三行数:-3,9,-27,81,-243,…-5,7,-29,79,-245,…-1,3,-9,27,-81…(
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观察下面三行数,-3,9,-27,81,-243…… 1,13,-23,85,-239…… 1,-3,9,-27,81
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观察下面三行数,-3,9,-27,81,-243…… 1,13,-23,85,-239…… 1,-3,9,-27,81
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一道数学题~~大家进来看看!观察下面的数:3,9,27,81,243,729,…1,7,25,79,241,727,…1
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观察下面这三行数 3,-9,27,-81.① -1,3-9,27.② 4,-8,28,-80,.③
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