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你要等價無窮小,首先先要是無窮小(極限是0),所以你需要說明是x趨向那個值的時候,是無窮小.e2x次方+1到底是e的指數是2x+1,還是e的指數是2x,然後e的這個2x次幂在加上1?,如果是e^(2x+1),那麼x→-∞時,e^(2x+1)→0,是無窮小,而x→-∞時,無論是2x還是2x+2都不是無窮小. 如果是e^(2x)+1,那麼這個函數不可能趨近於0,不可能是無窮小.
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