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mmc解三次方程的根能否用余弦表示

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其妙 posted 2015-2-10 21:28 |Read mode

mmc解三次方程的根，有时不是特殊数，结果是用了虚数（虽然有时候是实根），能否用余弦表示呢？

妙不可言，不明其妙，不着一字，各释其妙！

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test posted 2015-2-10 22:43

自己代公式吧……

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战巡 posted 2015-2-16 18:19

回复 1# 其妙

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kuing posted 2015-2-16 18:29

回复 3# 战巡

还能这样玩……

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original poster 其妙 posted 2015-2-21 16:11

回复 3# 战巡

，多谢战神！巡神！

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original poster 其妙 posted 2015-7-18 16:58

1blog图片.jpg

妙不可言，不明其妙，不着一字，各释其妙！

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original poster 其妙 posted 2015-7-25 20:01

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妙不可言，不明其妙，不着一字，各释其妙！

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