[ij] Ʒ '' ۿ.
ȸ : 3,759
![Ե ̹ ּ](https://o.twimg.com/1/proxy.jpg?t=FQQVBBgpaHR0cHM6Ly90d2l0cGljLmNvbS9zaG93L2xhcmdlLzZldDRlcy5qcGcUAhYAEgA&s=1I4AtFRp81OUDPf0Q3O9xSS1m7pDoKcKBj-d4X9Pyms)
̰ɺ 'ȭ Ѵ' µ,
'' û ް ϴ.
'ȭ Ѵ' ̴ϴٸ ·...
̳ ī峪 ⺻ ϱ, δ ׳ 'ī ױ' ̾߱ϰڽϴ.
츮 ̰ǵ,
'ī ƿø ī带 ٱ о ?'
ظ ϱ ̸ ڸ,
![](http://www.m-a-g-i-c.com/images/cardcastle2.gif)
ϴ ī ױ ƴ϶ Ʒó ƿø ϴ ̴ϴ.
![](http://www.antiquark.com/img/harmonic_stackdominoes90.gif)
(ǻ 常-_-) ũ е ī尡 Ʒ ó ֽϴ.
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⼭ ī带 ٱ о ?
翬 ī ̰? Ʒ ó.
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(ī ü ̴ 1̶ ϰڽϴ. κ ̴ 1/2.)
̹ ι° ī带 о ϴ. ž ʶ߸ ʴ ¸ ϸ鼭 о ?
״ ƴմϴ. ī κ ī ״ϱ.
κ ( ) x ϸ Ʒ ôٽ
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|x| |x| 1/2
ī尡 üκ κ 2x+(1/2) ˴ϴ. ī , 1 ǹǷ ִ ִ ̴ 2x+(1/2)=1, x=1/4 ǰڳ. ġմϴ.
̹ ° ī带 о ϴ. Ȱ?
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|x| |x|
κ 3x+2(1/4)+1/2 = 3/2 ϹǷ x=1/6.
ī尡 û Ƶ Ȱϴ.
ణ ġ ϸ ° ī 1/8ŭ о ̴ϴ.
ټ° ī? 1/10.
.
.
.
n° ī? 1/(2n).
, Ȱ ٲ ô.
ī带 ٱ о ٴ īκ ־ ִ°?
Ƿ ̷ 츮 1/2 + 1/4 + 1/6 + 1/8 + ... + 1/(2n) ̴ϴ. ٽ 1/2 (1+ 1/2 + 1/3 + 1/4 + ... +1/n).
⼭ ȣ ȿ ִ 1+ 1/2 + 1/3 + 1/4 + ... +1/n ȭharmonic series մϴ.
б ' ' ȭ̶ Ѵٰ µ, ű 'ȭ' ̸ ٴ Դϴٸ-_-
ƴϴ Ѿ ȭ ȭ θٴ ̾߱ϰ Ѿ.
ȭ κ ϴ ˷ ٴ ̴ϴ. ū n ־ Ŀ ִ ڵ ϳ ñߴ µ.
ѿ ڸ '/' ΰ ñߴٴ ̴ϴ.
װ ְ ٷ Դϴ. Ʒ .
츮 ȭ ֽϴ. y=1/x 簢 Ȯϰ ȭ ġϰ ˴ϴ.
ᱹ ȭ y=1/x Ʒ ̿ ̴ ϴ. ( ʽϴٸ)
![](http://mathfactor.uark.edu/images/harmonic2.jpg)
̾߱ϴ ߿ ô? ٷ,
Ʒ () Լ y=1/x ̺ () ִ ⺻ Դϴ.
ι ⼭ OTL ε, y=1/x αԼ ( αԼ 鿡Դ ũū Դϴ. 뷫 2.7̶ Ӵϴ) ̰ ߿ ϳԴϴ.
αԼ б 1 ũ⸸ ϸ Ʒ ˴ϴ.
![](http://onemathematicalcat.org/Math/Algebra_II_obj/Graphics/log_base_gt1.gif)
. ȭ Ѵ, 1+ 1/2 + 1/3 + 1/4 + ... +1/n n Ŀ Ŀ ̴ϴ.
. 1+ 1/2 + 1/3 + 1/4 + ... +1/n 100 ǰ n ũ ƾ ΰ?
ϴ. log_{2.7} n= 100 Ǹ ˴ϴ. 뷫 (2.7)^{100} ? ̰ ū Ͽ (б ) 10 ϴ α ϴ.
log_{10} (2.7)^{100} = 100 log_{10} 2.7= 43.13 (log_{10} 3=0.4771 ̿߾).
, ƿͼ,
ī 100 ̸ŭ ī带 ٱ о
20000000000000000000000000000000000000000000 ƿø ȴ .
A, ̰ -_-;;;;;
Comments
ϴ.