※ 引述《iloveconic (樂陶陶)》之銘言：
: lim (x-lnx)
: x->無限
Let x＞e,
x
∫ (1 - 1/t) dt ＝ x - ln x + (1 - e)
e
x
≧ ∫ (1 - 1/e) dt ＝ (x - e) * (1 - 1/e)
e
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