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数学 高校生

(3)の丸したところが分かりません!なぜ1/2にするのですか?解説お願いします🙇🏻‍♀️

第4問 (選択問題) (配点20) 太郎さんのクラスと花子さんのクラスでは、修学旅行で新幹線を利用すること になった。二つのクラスの人数は合わせて80人である。 また,新幹線の座席は, 2列シートまたは3列シートになっている 使用するシートの中に空席ができないように座席の割り振りを考えよう。 (1) 2列シートをxシートだけ使い, 3列シートをシートだけ使うとする。 このとき、x,yは方程式 2x+3y=80 を満たす。 ① において, x=1 とすると, y = アイであり 2・1+3・ アイ=80 が成り立つ。 ①,②から, 方程式 ① の整数解を求めると, kを整数として ウk+1,y= エオ+ カキ と表される。 方程式 ① を満たす0以上の整数x,yの組は全部でクケ組ある。 座席を割り振るとき, できるだけ2列シートだけや3列シートだけに偏るこ とがないようにしたい。 すなわち, |x-yl が最小になるようにするとき 2列シートをコサ シート, 3列シートをシスシート 使用すればよい。 .2 (第7回 19 ) (数学Ⅰ・数学A 第4問は次ページに続く。) (2) (1)より、二つのクラスの80人の座席を使用するシートの中に空席ができ ないように割り振ることができた。 次に、人数Nが2以上の場合、どんな人数であっても、使用するシートの 中に空席ができないように座席を割り振ることができることを確かめよう。 例えば, N = 2,3,4,5について などと表すことができる。 一般に, 2以上のある自然数Aについて, 0 以上の整数x,yを用いて 2x+3y= A と表されたとする。 このとき, x,yのうち少なくとも一つは正の数であり, y≧1のとき 20 セ +3( x≧1のとき 2 =2のときは, x=1, y=0 として N = 2.1+3.0 N=3のときは, x=0, y=1として N=2.0+3・1 N=4のときは, x=2, y=0 として N=2・2+3.0 人間 N=5のときは, x=1, y=1として N=2・1+3・1 t (0) ソ x-2 y-2 タ チ +3 チ (1) x-1 =A+1 と, A +1 を表すことができる。 これを繰り返せば、2以上のどのような自然数も2x+3y (x,yは0以上の 整数) の式で表すことができる。 y-1 =A+1 セ の解答群 (同じものを繰り返し選んでもよい。 ) (2) y タ ≧0, ≧0, (第7回20) x+1 の解答群 (同じものを繰り返し選んでもよい。) ③ y+1 チ N N (4) x+2 y+2 (数学Ⅰ・数学A 第4問は次ページに続く。)

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数学 高校生

(3)の丸したところが分かりません!なぜ半分にするのですか?解説お願いします🙇🏻‍♀️

第4問 (選択問題) (配点20) 太郎さんのクラスと花子さんのクラスでは、修学旅行で新幹線を利用すること になった。二つのクラスの人数は合わせて80人である。 また,新幹線の座席は, 2列シートまたは3列シートになっている 使用するシートの中に空席ができないように座席の割り振りを考えよう。 (1) 2列シートをxシートだけ使い, 3列シートをシートだけ使うとする。 このとき,x,yは方程式 2x+3y=80 を満たす。 ①において, x=1 とすると, y = アイであり 2・1+3・ アイ=80 が成り立つ。 ①,②から, 方程式 ① の整数解を求めると, kを整数として x= ウk+1, y = エオ+ カキ と表される。 方程式 ① を満たす0以上の整数x,yの組は全部でクケ組ある。 座席を割り振るとき,できるだけ2列シートだけや3列シートだけに偏るこ とがないようにしたい。 すなわち, |x-yl が最小になるようにするとき 2列シートをコサ シート, 3列シートをシスシート 使用すればよい。 ..② ( 第7回 19 ) (数学Ⅰ・数学A 第4問は次ページに続く。) (2) (1)より、二つのクラスの80人の座席を使用するシートの中に空席ができ ないように割り振ることができた。 次に,人数Nが2以上の場合、 どんな人数であっても、 使用するシートの 中に空席ができないように座席を割り振ることができることを確かめよう。 例えば, N = 2,3,4,5について などと表すことができる。 =2のときは, x=1, y=0 として N = 2.1+3.0 N=3のときは, x=0, y=1として N = 2.0+3・1 N=4のときは, x=2, y=0として N=2・2+3.0 人 N=5のときは, x=1, y=1として N=2・1+3・1 一般に, 2以上のある自然数Aについて 0 以上の整数x,yを用いて 2x+3y=A と表されたとする。 このとき, x,yのうち少なくとも一つは正の数であり, y≧1のとき 20 セ +3( + ≧0, t (0) x-2 ソ チ x≧1のとき 20 と, A +1 を表すことができる。 これを繰り返せば, 2以上のどのような自然数も2x+3y (x,yは0以上の 整数)の式で表すことができる。 タ y-2 (1) x-1 +3 チ タ の解答群 (同じものを繰り返し選んでもよい。 ) =A+1 y-1 =A+1 (2) x タ ≧0, x+1 の解答群(同じものを繰り返し選んでもよい。) (2) y (3) y+1 (第7回20) チ 2 2 (4) x+2 y+2 (数学Ⅰ・数学A 第4問は次ページに続く。)

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英語 中学生

長い文章ですが、1〜6まで教えてください🙇‍♀️ お願いします🙇‍♀️

4 次の英文は、中学生の涼太 (Ryota) がある出会いを通して学んだことについて 英語 の授業でスピーチをしたときのものです。 1~6の問いに答えなさい。 I Hi. I'm going to talk about my experience this summer. visited my brother, Takuya, in Tokyo. He has lived there and studied at a college for two years. I took the eleven o'clock An hour later, a foreign Shinkansen for Tokyo on July 26. woman with a big bag came to the seat next to me. She smiled s at me, but I didn't talk to her. She looked at the baggage rack for a while and then sat in her seat. She put her big bag on her lap because she could not put it on the baggage rack. I thought I should help her, but I didn't do anything for her. She was on the Shinkansen for about one hour and got off. About one hour later, I arrived at Tokyo Station. That night, my brother and I talked about the woman on the Shinkansen. I But I said, "I didn't do anything for her because I can't speak English well. know I should help her." He asked me, "Ryota, if a Japanese woman with a I big bag comes to the seat next to you, will you help her?" I said, "Well ..., don't know." He said, “I don't think that you didn't help the woman on the 15 Shinkansen because you can't speak English. We need some courage when we want to be kind to someone. When I was a junior high school student, I also didn't have courage. You need to have courage, Ryota." I said to him, "I see. I'll have courage to be kind to people around me." I thought, "What should I say in English when I want to help someone?" 10 courage : 20 On the return Shinkansen, the foreign woman came to the seat next to me again! She had the big bag again. I thought I should have courage and said, "Excuse me. ()" She said, "Oh, thank you very much." Then I put her bag on the baggage rack and asked her, "Do you remember me? I was next to you on the Shinkansen two days ago." She smiled at me and said, "Wow ! 25 Yes. I remember you. Hello again." I felt very happy and said to her, "I'm Ryota. You could not put your bag on the baggage rack two days ago. I knew that, but I didn't do anything. I'm sorry." She said, "Oh, it's OK. You are kind. I'm Anila, from India. This is my first trip to Japan." Then we talked a lot together. I talked about my family and school life. I 30 was (2) because I could talk in English. That was my first experience for me. When she got off the Shinkansen, she smiled at me and said, "I hope we can meet again." I learned an important thing from my brother. Thank you very much. () experience: # college: take ... for ~ : ~行きの・・・ に乗る foreign: 外国の seat: baggage rack: 500 next to ~: ~のとなりの [に] smile at ~: ~にほほえむ for a while : しばらくの間 lap : ひざ anything: (否定文で) 何も return: 帰りの Anila: アニラ (女性の名前)

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英語 中学生

長いですが、1〜6まで教えてください🙇‍♀️🙏

4 次の英文は、中学生の涼太 (Ryota) がある出会いを通して学んだことについて 英語 の授業でスピーチをしたときのものです。 1~6の問いに答えなさい。 I Hi. I'm going to talk about my experience this summer. visited my brother, Takuya, in Tokyo. He has lived there and studied at a college for two years. I took the eleven o'clock An hour later, a foreign Shinkansen for Tokyo on July 26. woman with a big bag came to the seat next to me. She smiled s at me, but I didn't talk to her. She looked at the baggage rack for a while and then sat in her seat. She put her big bag on her lap because she could not put it on the baggage rack. I thought I should help her, but I didn't do anything for her. She was on the Shinkansen for about one hour and got off. About one hour later, I arrived at Tokyo Station. That night, my brother and I talked about the woman on the Shinkansen. I But I said, "I didn't do anything for her because I can't speak English well. know I should help her." He asked me, "Ryota, if a Japanese woman with a I big bag comes to the seat next to you, will you help her?" I said, "Well ..., don't know." He said, “I don't think that you didn't help the woman on the 15 Shinkansen because you can't speak English. We need some courage when we want to be kind to someone. When I was a junior high school student, I also didn't have courage. You need to have courage, Ryota." I said to him, "I see. I'll have courage to be kind to people around me." I thought, "What should I say in English when I want to help someone?" 10 courage : 20 On the return Shinkansen, the foreign woman came to the seat next to me again! She had the big bag again. I thought I should have courage and said, "Excuse me. ()" She said, "Oh, thank you very much." Then I put her bag on the baggage rack and asked her, "Do you remember me? I was next to you on the Shinkansen two days ago." She smiled at me and said, "Wow ! 25 Yes. I remember you. Hello again." I felt very happy and said to her, "I'm Ryota. You could not put your bag on the baggage rack two days ago. I knew that, but I didn't do anything. I'm sorry." She said, "Oh, it's OK. You are kind. I'm Anila, from India. This is my first trip to Japan." Then we talked a lot together. I talked about my family and school life. I 30 was (2) because I could talk in English. That was my first experience for me. When she got off the Shinkansen, she smiled at me and said, "I hope we can meet again." I learned an important thing from my brother. Thank you very much. () experience: # college: take ... for ~ : ~行きの・・・ に乗る foreign: 外国の seat: baggage rack: 500 next to ~: ~のとなりの [に] smile at ~: ~にほほえむ for a while : しばらくの間 lap : ひざ anything: (否定文で) 何も return: 帰りの Anila: アニラ (女性の名前)

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英語 中学生

長いですが、1〜6の問題を教えて欲しいです🙏

4 次の英文は、中学生の涼太 (Ryota) がある出会いを通して学んだことについて 英語 の授業でスピーチをしたときのものです。 1~6の問いに答えなさい。 I Hi. I'm going to talk about my experience this summer. visited my brother, Takuya, in Tokyo. He has lived there and studied at a college for two years. I took the eleven o'clock An hour later, a foreign Shinkansen for Tokyo on July 26. woman with a big bag came to the seat next to me. She smiled s at me, but I didn't talk to her. She looked at the baggage rack for a while and then sat in her seat. She put her big bag on her lap because she could not put it on the baggage rack. I thought I should help her, but I didn't do anything for her. She was on the Shinkansen for about one hour and got off. About one hour later, I arrived at Tokyo Station. That night, my brother and I talked about the woman on the Shinkansen. I But I said, "I didn't do anything for her because I can't speak English well. know I should help her." He asked me, "Ryota, if a Japanese woman with a I big bag comes to the seat next to you, will you help her?" I said, "Well ..., don't know." He said, “I don't think that you didn't help the woman on the 15 Shinkansen because you can't speak English. We need some courage when we want to be kind to someone. When I was a junior high school student, I also didn't have courage. You need to have courage, Ryota." I said to him, "I see. I'll have courage to be kind to people around me." I thought, "What should I say in English when I want to help someone?" 10 courage : 20 On the return Shinkansen, the foreign woman came to the seat next to me again! She had the big bag again. I thought I should have courage and said, "Excuse me. ()" She said, "Oh, thank you very much." Then I put her bag on the baggage rack and asked her, "Do you remember me? I was next to you on the Shinkansen two days ago." She smiled at me and said, "Wow ! 25 Yes. I remember you. Hello again." I felt very happy and said to her, "I'm Ryota. You could not put your bag on the baggage rack two days ago. I knew that, but I didn't do anything. I'm sorry." She said, "Oh, it's OK. You are kind. I'm Anila, from India. This is my first trip to Japan." Then we talked a lot together. I talked about my family and school life. I 30 was (2) because I could talk in English. That was my first experience for me. When she got off the Shinkansen, she smiled at me and said, "I hope we can meet again." I learned an important thing from my brother. Thank you very much. () experience: # college: take ... for ~ : ~行きの・・・ に乗る foreign: 外国の seat: baggage rack: 500 next to ~: ~のとなりの [に] smile at ~: ~にほほえむ for a while : しばらくの間 lap : ひざ anything: (否定文で) 何も return: 帰りの Anila: アニラ (女性の名前)

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英語 中学生

とても長い文章ですが、読んで頂き、1〜6まで教えて欲しいです🙏

4 次の英文は, 中学生の涼太 (Ryota) が、 ある出会いを通して学んだことについて,英語 の授業でスピーチをしたときのものです。 1~6の問いに答えなさい。 I Hi. I'm going to talk about my experience this summer. visited my brother, Takuya, in Tokyo. He has lived there and studied at a college for two years. I took the eleven o'clock An hour later, a foreign Shinkansen for Tokyo on July 26. woman with a big bag came to the seat next to me. She smiled 5 at me, but I didn't talk to her. She looked at the baggage rack for a while and then sat in her seat. She put her big bag on her lap because she could not put it on the baggage rack. I thought I should help her, but I didn't do anything for her. She was on the Shinkansen for about one hour and got off. About one hour later, I arrived at Tokyo Station. I don't know. That night, my brother and I talked about the woman on the Shinkansen. I But I said, "I didn't do anything for her because I can't speak English well. know I should help her." He asked me, "Ryota, if a Japanese woman with a big bag comes to the seat next to you, will you help her?" I said, "Well He said, "I don't think that you didn't help the woman on the 15 Shinkansen because you can't speak English. We need some courage when we want to be kind to someone. When I was a junior high school student, I also didn't have courage. You need to have courage, Ryota." I said to him, "I see. I'll have courage to be kind to people around me." I thought, "What should I say in English when I want to help someone?" ...9 10 courage : 1007 20 On the return Shinkansen, the foreign woman came to the seat next to me again! She had the big bag again. I thought I should have courage and said, "Excuse me. ()" She said, "Oh, thank you very much." Then I put her bag on the baggage rack and asked her, "Do you remember me? I was next to you on the Shinkansen two days ago." She smiled at me and said, "Wow ! 25 Yes. I remember you. Hello again." I felt very happy and said to her, "I'm Ryota. You could not put your bag on the baggage rack two days ago. I knew that, but I didn't do anything. I'm sorry." She said, "Oh, it's OK. You are kind. I'm Anila, from India. This is my first trip to Japan." Then we talked a lot together. I talked about my family and school life. I 30 was (2) because I could talk in English. That was my first experience for me. When she got off the Shinkansen, she smiled at me and said, "I hope we can meet again." I learned an important thing from my brother. Thank you very much. () experience: # foreign : 外国の seat: baggage rack: college # take ... for ~: ~ 行きの・・・ に乗る next to ~~のとなりの[に] smile at ~: ~にほほえむ for a while: しばらくの間 lap : ひざ anything: (否定文で)何も return: 帰りの Anila : アニラ (女性の名前)

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