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数学 高校生

数三積分の問題なのですが、なぜ3行目で常に〰︎︎または〰︎︎では無いと分かるのか理由を教えて頂きたいです。

数列の和の不等式の証明 重要 例題 232 nは2以上の自然数とする。 次の不等式を証明せよ。 1 1 log(n+1)<1+- + +...... + <logn+1 3 指針 数列の和 1+ 1 1 + 2 3 解答 自然数 から 1 常に+1 1 k+1 k=1Jk k≦x≦k+1のとき に対して, 1 すなわち, 曲線 y= の下側の面積と階段状の図形の面積を比較して,不等式を XC 証明する。 1 x •k+1 dx k よって Sa+¹ dx < 1/1/2 k k n nk+1 dx x k=1 M であるから k+1 k n-1k+1 dx 1 k+1] 1 1 k k+1 または (+) doo S xC (+1dx •k+idx +......+ x =log(n+1) 1 1 k = •k+¹ dx k x k+1dx dx < 1/2 k 21 =1k 4²0= logx 定積分の利用(面積比較) ck+¹ dx k ではない jk log(n+1)<1+ 1 は簡単な式で表されない。 そこで,積分の助けを借りる。 n 1n+1 ©から dx f" d= [108x] "=1 1+1/²/2 + 1/²/3 基本229231 演習 236237 k=13k → この不等式の両辺に1を加えて よって, ①② から n≧2のとき n y₁ 1 +.... 1 1 (2) 2√n+1-2<1+ √2+√3 y= 0 123.n\x n-1n+1 k=1Jk k=1k+1 =logn であるから 0 123・・・ n n-1 1 <D Ⅱ 式イ 1 n nick+1 dx 式 1 1 2 1 1 1+ + + 2 3 log(n+1)<1+ + +......+ 1 3 + +・ 練習 次の不等式を証明せよ。 ただし、nは自然数とする。 (3 232 1 1 (1) + + + + + + + < 2-1 (n=2) <2- n² n ++/² n 1 n 1 + 2 3 1 k + YA *@S² + S² • -≤2√n-1 1 k+1 0 k n+1 =S+ k+1' で k=1,2 n と して辺々を加える。 n <logn+1 a+1dx X +・・・・・・+ k+1 として辺々を加える。 1 <logn 1 n +...+ で k=1,2, ....... n-1 Ca+1 x .... (2) <logn+1 〔(2) お茶の水大] p.362 EX207 361 7章 36 定積分と和の極限、 不等式

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英語 高校生

(24)の答えがなぜ1になるか分からないです…

(24) The Tale of Mejk Swenekafew Recently, many people have been talking about "fake news" news reports that are untrue. However, such reports have been around for a long time. They are sometimes used in order to get more people to read newspapers, watch TV programs, or visit online news sites. People also use fake news to spread their political or religious beliefs. However, ( 24 ) publishing fake news. In 1903 in the city of Clarksburg, West Virginia, fake news was used to check/if newspaper was really writing its own articles. In the city, there were two rival newspapers, the Clarksburg Daily Telegram and the Clarksburg Daily News. The Daily Telegram's staff believed that the Daily News's reporters were ( 25 ). The Daily Telegram decided to check whether this was happening. It published a fake news story about a man who had been shot after an argument about a dog. The man's name was Mejk Swenekafew. Soon afterward, exactly the same news appeared in the Daily News. However, the reporters at the Daily News had not noticed that the name "Swenekafew" was actually "we fake news" written backward. They were forced to admit that they had copied the Daily Telegram's article. These days, there is more pressure than ever on newspapers, news programs, and news websites to get more readers, viewers, and visitors. In order to do so, they need to report big news stories as quickly as possible. ( 26 ), they are constantly watching each other to make sure they have the latest stories. However, they need to be careful not to do the same thing that the Clarksburg Daily News did. these are not the only reasons for many popular websites have been there are rules to stop people from some TV companies began by a

未解決 回答数: 1