Grade

Type of questions

English Junior High

根気強く英文読める方お願いします🙏 この問題の(2)は合っているでしょうか。 違うのなら違う理由も教えてくれるととても嬉しいです😭お願いします

TREK [3] 9分 10 2935 受験 難問 次の英文を読んで、あとの(1)~(3)の問いに答えなさい。('13 神奈川県) Brian is a high school student from America. He joins a *volunteer club at school. Last Sunday he went to a "nursing home with his friends to teach the old people living there about computers. Mr. Doi, one of the old people there, is talking with Brian in a room at the nursing home. sdgoon 5 Mr. Doi: Hello, I am Kazuo Doi. Nice to meet you. Thank you for coming today. Nice to meet you, too. My name is Brian. What can I do for you, Mr. Doi? Brian Mr. Doi: Can you teach me how to send e-mails, Brian? Brian Mr Doi : Brian Of course, I can. Do you want to send an e-mail to anyone? Yes. One of my friends lives in a nursing home in Hokkaido. I have not seen her for a long time, but she sent me a "postcard last summer. She wrote her *e-mail address on the postcard. I want to send her an e-mail to say "Hello," but I don't know how to do it. salad : Don't worry, Mr. Doi. It is not difficult to send an e-mail. Tellsafi Two days later, Brian and his friend Yumi are talking in their classroom. 15 Yumi Brian Yumi Brian : 20 Yumi : Brian, I hear you went to a nursing home last Sunday, right? : Yes. I went there to do *volunteer work with my friends. : That's great. What did you do there? odon of d We taught the old people living there about computers. They were very glad to learn how to use computers. What did you teach them about computers? I taught some old people how to send e-mails. Mr. Doi was one of them and Brian : his English was good. Read this e-mail from him. He sent it to me yesterday. Brian and Yumi are reading the e-mail from Mr. Doi. Hello, Brian, 100 living here enjoy it. I am sending this e-mail with a picture of me *in front of a microphone." Her e-mail was *encouraging to me. Now I have found an important thing to me. It is to try new things. When I find a new thing to try, I will send you an e-mail again. 35 Kazuo Doi After reading the e-mail from Mr. Doi, Yumi and Brian are talking again. Yumi Mr. Doi enjoys *communication by e-mail. Brian Yes. I'm very happy to hear that. Yumi You did a good thing, Brian. 40 Brian Yumi Brian 45 Yumi : Brian Yumi 50 Brian Yumi 55 Brian T Thank you for coming last Sunday. Do you remember my friend who sent me a postcard with her e-mail address? After I sent her an e-mail, she sent me an e-mail back soon. Using e-mail is a lot of fun. In her e-mail she said, "Now I am trying a new thing in my nursing home. I am *in charge of an announcement over the PA system for 10 minutes in the morning. During this time, I read the *newspaper of the day and make some *comments. Many people Yumi Thank you, Yumi. I went to the nursing home to teach the old people there about computers, but I also learned something there. : What is it, Brian? Mr. Doi knew his friend was in charge of an announcement over the PA system, and then he started to think about trying a new thing, too. I know. Mr. Doi says, "encouraging" in his e-mail. Right. When I taught him how to send e-mails, he said, "I have wanted to learn a lot of things. Using e-mail is one of them." I see. You want to say the e-mail from his friend made him more *positive, right? That's right. First, Mr. Doi learned how to send e-mails and wrote an e-mail to his friend. Next, he got an e-mail from his friend and knew his friend was trying a new thing. Now Mr. Doi ( ) to him. Mr. Doi thinks that it is to try new things. We can say it is good to know how our friends are doing. It is wonderful to *communicate with other people, Brian. : I think so, too. Communicating with other people can make people more positive. I learned that from volunteer work in the nursing home. : I hope that Mr. Doi can find a new thing to try. Please tell me when you get an e-mail from him again. (注) volunteer club ボランティアクラブ nursing home 老人ホーム send〜 〜を送る postcard 絵はがき e-mail address 電子メールアドレス (約 685 語) volunteer work ボランティア活動 in charge of an announcement over the PA system 館内放送を担当して comments コメント in front of a microphone マイクの前の communication by e-mail 電子メールによるコミュニケーション communicate with ~ ~とコミュニケーションをとる newspaper encouraging 励みになる positive 前向きな

Solved Answers: 1
Mathematics Senior High

ほんとに初歩的な質問です。高校1年。数学Iです。なぜこの問題で角Cが90度だということがわかるんですか? 私はわからず角Aを90度と置いてしまいました。角Aでも解けるんですか、?

0.63 基本 例題 66 最大・最小の文章題 (1) 117 BC=18, CA=6 である直角三角形ABC の斜辺 AB 上に点Dをとり,Dか ら辺BC, CA にそれぞれ垂線 DE, DF を下ろす。 △ADFとDBEの面積 の合計が最小となるときの線分 DE の長さと,そのときの面積を求めよ。 00000 基本 60 CHART & SOLUTION る。 文章題の解法 最大・最小を求めたい量を式で表しやすいように変数を選ぶ DE = x とすると, 相似な図形の性質からADF, △DBEはxの式で表される。 また、xのとりうる値の範囲を求めておくことも忘れずに。 3章 8 解答 DE=x とし, △ADFとDBEの 面積の合計をSとする。 0<x< 6 ...... ① 0<DE=FC<AC であるから A D F (辺の長さ)>0 B E C ← xのとりうる値の範囲。 AF=6-x △ABC∽△ADF であり, △ABC: △ADF=62: (6-x)2 △ABC=18・6=54 であるから △ADF= AADF=(6-x)2.54-(6-x)² 相似比がmin→ 面積比は2n2 三角形の面積は 1 (底辺)×(高さ) 2 よって ADBE= -.54=x² = 同様に,△ABC∽△DBE であり △ABC: △DBE=62:x2 x² 62 AS したがって, 面積は 549 S=△ADF+ △DBE -3-((6-x)²+x²) 27 2次関数の最大・最小と決定 別解 長方形 DECF の面積 をT とすると, Tが最大に なるときSは最小となる。 DF=3(6-x) から T=x3(6-x) =-3(x-3)2+27 0<x<6 から, x=3でT は最大値 27 をとる。 よって、 線分 DE の長さが 3のとき, Sは最小値 =3(x²-6x+18) =3(x-3)2+27 0 3 6 1・6・18-27=27 2 ①において, Sはx=3で最小値27 をとる。 をとる。 よって、線分 DE の長さが3のとき面積は最小値 27 をとる。 PRACTICE 663

Solved Answers: 1
100/1000