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Mathematics Senior High

線部分の計算の過程を教えてください

Cher え方 各項の底と真数に着目し,群数列として考えるとよい。 (3) 第2031 項の値と一との大小を比較せよ。 ge 1, log:2, loga1, log32, log33, loga1, log42, log43, log44, logs1, 2) 第を項が初項から数えてn番目の0となるとき, kをnの式で表せ。 群数列3 288 次の数列について, 第8 ;との大小を比較せよ。 2 (大阪工業大) |2,23, 3, 34,4, 4, 45, 1,2|1, 2, 3|1, 2, 3, 41, 底: っまり、第m群の第え項は1ogm+1k で表すことができる。(底の数)-1が第何 (1) loga1=log31=log41=logs1=0, 群か,真数がその群 で何項目かを表して loga2=logs3=1og44=1, log42= log22 1 1 三 log24 21og22 2' いる。 log33 log.3= log34 また 1 1 loga421og。22a 第10項までを具体 的に計算する。 7 1 1 よって,0+1+0+a+1+0++ 2a +1+0=a+- 1 2a logal=0, logaa=1 2 (2) 0になるのは各群の第1項であるから, n番目に0に なる数は,第n群の第1項である. 第(n-1)群 (n>2) 2 底の変換公式 logab=logeb logea までの項数の和は, 2+3+…+{(n-1)+1} より, (0 1 た=(2+3+………+n)+1=n(n+1) これは n=1 のときも成り立つので, 【k==n(n+1) 1 3)63-64=2016, -· < -64·65=2080 より, 第2031項は, 2 第2031 項を第63 群 2 の第を項とすると, 第63 群の第16項となり, loge416である。 log216 _log22*_4 3 2031=2016+k-1 1 k=16 2 2 したがって, log64 16= log. 64 loga2-6=。 よって、 1 (第2031 項の値)>

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English Senior High

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The response of local people to volunteer work by high school students 2 The importance of volunteer work by high school students in a community 1 Understanding the community in which high school students live 3 The success of a high school through the efforts of a great principal 2. According to the glaph and table, which of the following is true about the students at 2/4 速読編 【目標時間8分) 8点 1 Which is the best title for the passage? 精読編 【目標時間 12分) 内容理解 St. Martin's? 0 Nearly half of them did five to ten hours of volunteer work a month (6点) 2 Alarge percentage of them did not do any volunteer work. 。Thev were not so interested in helping others as in learning something new. The most popular reason for volunteering was to get work experience. 3. According to the passage, which of the following is true about St. Martin's High School in 2008? (6点) 0 Parents wanted to move the school toa new location in a new city. 2 Mr. Amster thought the students should learn more about the community. 3 The students did more volunteer work with their families than in 2009. 1 Half of the students and their families decided to leave the communitv. (6点) 4. 下線部(1)の this の内容を日本語で説明しなさい。 5. 下線部(2) を和訳しなさい。 (6点) (8点) 6. According to the passage, which of the following is true? U Volunteering has helped many students improve their self-esteem. The 2009 volunteer projects mainly involved cleaning the environment. 9MOS students stop doing volunteer work when thev graduate from school. Parents of the students do not take part in volunteer activities. 5

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