/story/202581/鬱兔生日募集q-a-腦洞大開/issue/4
【鬱兔生日募集Q&A】腦洞大開 ！ - 請問兔兔 | Penana
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【鬱兔生日募集Q&A】腦洞大開 ！
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【鬱兔生日募集Q&A】腦洞大開 ！
ENTRY #4
Author: 天兵
Published:
Jan 23, 2026
【鬱兔生日募集Q&A】腦洞大開 ！
Published:
Jan 23, 2026
ENTRY #4
請問兔兔
Author: 天兵
Published:
Jan 23, 2026
1 Min Read
54 Words
No Plagiarism!hMXhwpyWDhUMG5bmgNgDposted on PＥNAＮＡ

請問:

f(x,y)=x3+y3−3xy

  1. 求此函數的所有臨界點。

  2. 利用 Hessian 矩陣（或二階導數判別法），判斷每一個臨界點是

    • 局部極大值

    • 局部極小值

    • 還是鞍點。

216.73.217.15

ns216.73.217.15da2
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【鬱兔生日募集Q&A】腦洞大開 ！
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