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求帮忙微分問題

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wan jony

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Jun 4, 2015, 9:30:44 AM6/4/15
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吧里的大神能不能帮我搞定下这个?
a²=(dr/dx)²+(dr/dy)²+(dr/dz)²+(dr/dn)²
r在每个括号里对不同的数微分。
謝謝
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