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為甚麼二次函數中，a是正數，開口向上?
Author:
gklwong
為甚麼二次函數中 a是正數，開口向上?
留意 當x越來越大， f(x) 最受哪個項影響? 當x越來越小， f(x) 最受哪個項影響?
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