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#171 [
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‚O…|a+b|…|a|+|b|
ŒÌ‚É|a+b|^2…(|a|+|b|)^2‚Æ‚È‚é
(|a|+|b|)^2 -|a+b|^2
=2(|a||b|-ab)†0
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:12/02/22 21:43
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