数列anを求めたいんですけど、答えってこれでもあってますか？もし間違ってたらどこが間違ってるか教えてください。

192 第7章数 列 基礎問 精講 y 126 2 項間の漸化式(IV) (2)災 (3)750 a1= 0, an+1=2an+(-1)+1 (n≧1) で定義される数列{a} が ある. (1)b = m とおくとき, bm+1 を bm で表せ (2) 6m を求めよ. (3) am を求めよ. x=pan+gal (p=1,g*1) 型の漸化式の解き方には、次の2 通りがあります。 Ⅰ. 両辺を+1でわり, 階差数列にもちこむ (125ポイント) II. 両辺をg+1でわり, bm+1=rb+s 型にもちこむ この問題ではIを要求していますから にⅡによる解法を示しておき ます。 解答 (3)an=2"bm 考 -1)"-1 "= {2"-2". ("-")= | | (2"-2(−1)-1) 2-1 -(2-1-(-1)) (IIの考え方で) ①の両辺を (-1)+1 でわると, an+1 (-1)n+I an+1 2an (-1)n+r+1 an ここで、(1)" ③ より bn+1=-26n+1 1. だから、 b2-3 3 bn an+1 an=bm とおくと,i=bn+1 だから -2"-1 .. bn+1-3=-2(br− 1) b=(1-(-2)-1) an=(-1)"bm=1/2(21-(−1)"-1} 193 an+1=2am+(-1)+1 (1) ①の両辺を2+1でわると, ① ①に, a„=2"bn, n+1 ......2 an+1=2+1bn+1 を 代入してもよい 注 この問題に限っては, 両辺に (-1) "+1 をかけて (-1)"an=bn と =bm とおくとき, +1=61 と表せるので 2" ②より6+1=6+ (2) n≧2 のとき b=b₁+ 2+1 n+1 122 階差数列 おいても解けます. ポイント漸化式は,おきかえによって,次の3つのいずれかの 型にもちこめれば一般項が求まる I. 等差 Ⅱ.等比 III. 階差 k+1 [119] =0+ 1- 1+2 カー 初項/1/11 公比 -/1/2 演習問題 126 項数n-1の 等比数列の和 これは, n=1のときも含む. ◆吟味を忘れずに a=3, an+1=3an+2" (n≧1) で定義される数列{a}がある . (1)=6, とおくとき,bn+1とbの間に成りたつ関係式を求め (2) bnnで表せ. (3) annで表せ.

大至急！ 英検2級2024第3回のライティングです。 採点・添削をお願いします。 採点→各16点満点(内容4点、構成4点、語彙4点、文法4点)

2 (9)1(10)(11)2(12) (9)1(10) 1(11) 2(12)4(16) 4(14) 3(104(1047) 7/20) 1(203(22)3(2014(24)5253 (21) 3 (22) 3 (27) 4 (24) 3 (25 (1) 4 (30) 2 (27) 2(28) 2009)2(3074(2103 ④4 Some people decide to go to other countries to work. Going to other countries to work has benefits, such as ·learning a local language and helping their future career 10 10 9 On the other hand, the new work environment wouldn't get used to it or couldn't see their family and friends. ousity 20 50-

（２）〜（４）の求め方を教えてください🙏

STEP 問題 1 次の(1)~(4)にあてはまるヒストグラムをア~エからすべて選び、記号で答えなさい。 (1) 最大値がもっとも小さいものはどれですか。 (2) 10以上15未満の階級の度数が全体の25%であるものはどれですか。 (3) 平均値がもっとも大きいものはどれですか。 (4) 中央値がふくまれる階級の階級値と,最頻値が同じになるものはどれですか。 ア 15 イ 15 ウ I 15 10 5 10 5 10 0 0 5 10 15 20 25 30 5 10 15 20 25 30 5 10 15 20 25 30 10 5 5 10 15 20 25 30

高2英語 並べ替え問題を教えてください。

She didn't ( ) ( ) ( )( )( )( ) of the film. see 4 early (2) arrive 3 enough (5) the first part 6 to

フォーカスゴールドのⅡBCの方の例題15番の（2）番の3~4行目の解説が分かりません。教えてください

Step U ** 例題 15 二項係数の関係式(2)) nを正の整数として, 次の等式を証明せよ。 (1) C'C'+"C22+ "C32+......+C2=2C (2) 2≦n,r=1,2, .....*, n-1のとき, nCr=n-1Cr+n-C ** え方 (1) (1+x)=(1+x)".(x+1)” であるから (1+x) 2” の展開式における (1+x)" ×(x+1)” の展開式における x” の係数は一致する。」 答 (2) (1+x)*= (1+x) (1+x)"-1であり, 両辺のの係数は一致する. の (1) 二項定理 (a+b)" = "Coa"+"Cia" 'b+nCza"-262+......+.Cabにおい a=1 b=x とおくと、 (1+x)"="Co+nix+2x2+....+mCmx" a=x, b=1 とおくと、 (x+1)"="Cox"+"Cix”-1+nCzx"-2+......+mCm (1 + x)^*= (1+x)" (x+1)" が成り立ち 2n (1+x)2" の展開式における x”の係数は 27 Ch また. (1+x)". (x+1)* かけるとかになる +nCx") ……... ① 4.23 =(nCo+mCix+nCzx2 xnCox"+mix+2x2++mCm) の展開式における x” の係数は, CoxCo+CXC₁ + C₂ X C₂ + + n Cn × n C n =,C2+,Ci2+,C22+C3'++,C2 ...... ② ① ② は一致するから, C'+C'+,C2+,C32++,C2=2C (2) (1+x)"=(1+x) (1+x)"-1 である. (t)=(1+x)(-Co+n-C₁x +n-1C2x² + ..+n-1Cx-1x-1) ....n-1より の展開式におけるxの係数は、2≦n.r=1.2. ....... Cr+1C-1 である。 これは,左辺 (1+x)" の展開式におけるxの係数, C, と一致する。 よって, 2n, r=1,2, ・1のとき Cr=n-Cr+n-Cr-1 *** 2 P.24

(1、3)この英文で大丈夫ですか？

次の英文は,望 (Nozomi) が彼女の祖母について書いたものである。 この英文を読んで,(1)~(3)の問いに英語 で答えなさい。 I'm going to talk about my grandmother. She is sixty-three years old now. My grandmother likes swimming. She goes to a swimming school every Tuesday, Thursday and Saturday. She started to learn how to swim when she was sixty. One of her friends took her to the swimming school. There was a swimming class for old people who couldn't swim. Most of them were over sixty. She was surprised because old people were trying to do a new thing. She wanted to try something new so she decided to join the swimming class on that day. At first it s It took six months to swim. Now she can swim fifty meters. She said to me, "You can I hope I will enjoy swimming with her someday. was not easy for her to swim. start a new thing at any time." (注) most of~ 〜の大半 someday いつか over ~を超えて surprised 驚いた try to ~ ~しようと努める (trying は ing形) (1) How many times in a week does Nozomi's grandmother go swimming at the swimming school ? She goes swimming at the swimming school three times a week. (2) When did Nozomi's grandmother start to take a swimming class? She started to take a swimming class when was sixty. (3) Why did Nozomi's grandmother decide to join the swimming class? She wanted to try something new.

英語わかる方教えてください😭

[3]次の英文を読み, 各問いに答えなさい。 [思•判・表] (教科書 P.131~133 参照) Going Abroad We are told that going abroad can help us learn English and learn about other cultures, but there is a much more important reason to travel overseas. it helps us grow. First, - we learn to understand other people more. Foreigners are seen as people who are different from us, but if we become a foreigner, we must adapt to the social norms of another culture. Baseball legend Ichiro Suzuki said, [3] (5点x3) (1) @ (3) “Becoming a foreigner has taught me to be considerate and compassionate. These feelings only come through experience." Second, we are challenged with a variety of situations overseas. In facing these, we can find our true nature. Michelle Crichton, author of Jurassic Park, said, “Often I feel I go to some distant region of the world to be reminded of who I really am." ( ① ) whether you take a trip, study abroad, work abroad, or even perhaps marry someone in another country, take ②the challenge of becoming a foreigner. It may change your life. ' (1)筆者が鈴木イチロー選手の言葉を引用しているのは,以下のどの根拠を補強して説明するためですか。 ふさわしいものを選択肢から選び、記号で答えなさい。 ア. 海外へ行くことで,最新のスポーツや映画を楽しむことができる イ. 海外へ行くことで,さまざまな状況で試され成長できる ウ.海外へ行くことで,他者をもっと理解するようになる (2) ( 1 )に当てはまる語を選択肢から選び, 解答欄に書きなさい。 [ However / But / So / For example ] (3)下線部②「外国人になってみること」というのは具体的にどういうことですか。 下記のうち、本文中で述べられていない ものを1つ選び、記号で答えなさい。 ア. 海外で働くこと エ. 人生を変えること イ. 国際結婚をすること オ. 海外旅行に行くこと ウ. 海外留学をすること

(6)合っていますか？ ◻︎は、you didn't like to study foreign languages です

英 20 3 次の英文を読んで, (1)~(8) の問いに答えなさい。 them for my work now. 冬期‥ (三重県公立改) ☐ (1) aa □ (2) 本 Aiko is a student and lives in Suzuka. She is fifteen years old Noboru, her father is living and working in Fukuoka. Last summer Aiko visited him with her mother, When they went into his room in Fukuoka, they @(find) many books on his desk. They were surprised. The books were about foreign languages Aiko's mother said to him, "When you were a student ." He said, "That's right. I was not interested in foreign languages, but I need A lot of people from Asian countries come to my office. For example China, Korea and Thailand. Our languages are different, so we need to use a common language to communicate when we work together. We use English. I sometimes use Asian languages to be more friendly, so I'm studying some Asian languages now." "Do you enjoy it?" Aiko asked. "Well, it was hard at first, But I am very happy when I can communicate in those languages," Aiko's father said. ア イ ウ I

添削して下さい🙇‍♀️ お願いします。 英語で、テーマについて賛成反対を書く問題です。

4 あなたは、英語の授業で、次のテーマについてクラスで意見交換をすることにな りました。このテーマについて、賛成または反対のいずれかの立場で、 あなたの意 見を30語以上50語以内のまとまりのある英文で書きなさい。 なお、 2文以上にな っても構いません。ただし、下の【条件】 と 【注意事項】に従って書くこと。 紙の本より電子書籍の方がよい。 E-books are better than paper books. (注) e-book 電子書籍 【条件】 (1) 賛成か反対かの立場を明確にすること。 (2) 賛成か反対を選んだ理由を2つ挙げること。 【注意事項】 英文は次の記入例のように各下線上に1語ずつ書くこと。 短縮形 (I'll や don't など) は1語と数え、 符号 (.や? など) は語数に含めません。 (記入例) I'll go there. (3語)

問4の⑤の計算はどうすれば合うのですか。 教えてください🙇‍♀️ 3枚目が答えです。

次の英文を読んで,下の設問に答えなさい。 Last year, 4.2 million babies died. That is the most recent number reported by UNICEF of deaths before the age of one, worldwide. We often see lonely and emotionally charged numbers like this in the news or in the materials of activist groups or organizations. They produce a reaction. Who can even imagine 4.2 million dead babies? It is so terrible, and even worse when we know that almost all died from easily preventable diseases. And how can anyone argue that 4.2 million is anything other than a huge number? You might think that nobody would even try to argue (that, but you would be wrong. That is exactly why I mentioned this number. Because it is not huge: it is beautifully small. If we even start to think about how tragic each of these deaths is for the parents who had waited for their newborn to smile, and walk, and play, and instead had to bury their baby, then this number could keep us crying for a long time. But who would be helped by these tears? Instead let's think clearly about human suffering. The number 4.2 million is for 2016. The year before, the number was 4.4 million. The year before that, it was 4.5 million. Back in 1950, it was 14.4 million. That's almost 10 million more dead babies per year, compared with today. Suddenly this terrible number starts to look smaller. In fact (2)the number has never been lower. Of course, I am the first person to wish the number was even lower and falling even faster. But to know how to act, and how to prioritize resources, nothing can be more important than doing the cool-headed math and realizing what works and what doesn't. And this is clear: more and more deaths are being prevented. comparing the numbers. (3). We would never realize that without