等於不影響,最後會小於. Take δ=ε. Then ∀ x in 0<|x-c|<δ, ||x|-|c||<ε. Therefore lim(x→c)|x|=|c|. ○2 .Let ε>0,|√x-√c|=|(√x-√c)(√x+√c)/( ...
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