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数学 中学生

二次関数の変域の問題です。1.2.3について詳しく解説してくれると嬉しいです。

の変域 の変域 ン。 (2) とき) なるこ つうち, 負から正に変わっているので、yの変域は0以上または0以下となる。 また by 18よりyの変域は0以上で,a>0 とわかる。よって,b=0 一方、xの変域の両端の値のうち、絶対値の大きなx=3がy=18と対応するので,y=arにそれ ぞれ代入し, a=2と求まる。 答 a=2,b=0 中3で習う分野 問題 (解 mnを整数とする。関数y=axについて,xの変域がm≦x≦nのとき,yの変 0≦y2である。 m, nの値の組は全部で何通りありますか。 y=1/2xにおいて,yの値が2となるときのxの値は,y=2 を代入して, 2=1/2x2 よって、x=±2 (都立新宿高) 一方,比例定数は正で,yの変域が0以上ということを考えると,mは0以下で絶対値が2以下の 整数,nは0以上で絶対値が2以下の整数,さらにm,nのどちらか一方の値は必ず絶対値が2と なることがわかる。 EE, (m, n)=(-2, 0), (-2, 1), (-2, 2), (-1, 2), (0, 2) 5通り m n 入試問題にチャレンジ! 解答は, 別冊 p.47 2乗に比例する関数 Q問題 1 n を2以下の整数とする。 関数 y=xのxの変域がn≦x<3のとき,yの変域が 0≦y<9 となるnの値をすべて求めなさい。 ( 都立日比谷高) 9=9 12=0 m=0 1 問題2 関数 y=-- xについて、xの変域がa≦x≦a+5であるとき、yの変域が -4≦y0 となるようなαの値をすべて求めなさい。 ( 青山学院高 ) かる。 問題 3 α bを定数とする。 ただし, αは負の数とする。 3 関数 y=ax と1次関数y=2x+b において,xの変域が-1≦x≦3のとき,2つの関数の yの変域が一致した。 a, b の値をそれぞれ求めなさい。 (都立国分寺高) 101

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英語 中学生

3.4枚目が問題文、5枚目が答え、1.2枚目は問題を解くときに必要な文です。 なぜこの答えになるのかがわからないので教えてください。 解くのは大変だと思うので、一問だけでも大丈夫です。

2 次は, 高校1年生の Yusuke が書いた英文です。 これを読んで、 問1~間6に答えなさい。*印 のついている語句には、本文のあとに 〔注〕があります。(34点) My father loves *dinosaurs and *fossils. He (he/them/in/collects/is/that/interested /so) dinosaur toys, small fossils and books about dinosaurs. I heard he tried to find fossils along the river with my grandparents when he was young. When I was younger, my family took me to the science museum every year. My father loved looking at the dinosaur fossils there, and he always explained them to me. So, I got interested in dinosaurs and fossils, too. My father has a restaurant near our house, and he displays some dinosaur teeth fossils in the restaurant. One day, he introduced one of his customers to me. The man, Mr. Shirai, also loved dinosaurs and fossils, and often visited museums all around the world, such as in America, Canada and China. He realized that my father was interested in the same things because of the fossils in the restaurant. They became good friends. One day in September, Mr. Shirai came to my father's restaurant and showed me a fossil. It was a beautiful fish fossil in a brown stone plate. I was surprised to see it, Mr. Shirai A me a lot about the fossil. He traveled to Germany to look for fossils, and he found many fossils there such as fish, animal bones and leaves. The area is very famous for "archaeopteryx fossils. I once saw a picture of the archaeopteryx fossil in a book, so I wanted to go to see the fossil in -4-

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英語 中学生

英語の質問です! 画像の(画像暗くてすみません💦)の赤線引いた所の文で、「bags'」と書いてあるのですが、なぜbag'sではないのですか? 教えて頂けると有り難いです!m(_ _)m

to the city. Can we do anything to make foreign tourists more interested in our city?" Mary, one of the but only a few foreign tourists come members from Australia, said, "Why don't we make a video about Hikari City in English?" All the members said, "( ↑ )" The leader said, "OK. Let's make a great video and ask the staff members in Hikari City Hall to use it on their website." Then, three members went to Hikari Castle to get information and two members visited Hikari Flower Park to know more about it. Ryota and Mary were talking about Hikari Sunday Market. Mary said, "We can see the market in front of Hikari Station every Sunday. One of my classmates told me about it when I came to this city from Australia last year. I like talking with local people there. We can eat local food." Ryota said, "That's great. We can find something interesting there for our video. Can you go there with me this Sunday?" She said, "Of course." On the Sunday morning, Ryota and Mary went to Hikari Sunday Market. There were about fifteen stands and some people were buying products there. Mary said, "Look, that is my favorite stand." A woman at the stand was selling juice and cookies. Mary said to her, "Ms. Tanaka, the carrot cookies! bought last week were delicious. What do you recommend today?" The woman smiled and said, "Thank you, Mary. How about fresh tomato juice?" Ryota and Mary had the tomato juice and Ryota said, "Wow. it's delicious. How did you make this delicious juice?" Ms. Tanaka said, "Well, I use my mother's fresh tomatoes. She is a farmer in this city and picks them early in the morning every day." Ryota said to Ms. Tanaka, "I really love this juice." After saying goodbye to Ms. Tanaka, Mary found a new stand. She said, "Look at the stand which sells bags. They are so cute." Ryota agreed and said to Mr. Ito, the man in the stand. "Did you design them?" Mr. Ito said, "Yes. I designed them and the bags cloth is made in Hikari City." Ryota said, "Sounds interesting." Ryota and Mary walked around the market and enjoyed spending time there. 三重県'23年 英語 問題 (5)

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英語 中学生

英作文の確認お願い致します!! 問3です。

5 次は,アメリカ (the U.S.) からの留学生として昨年あなたの中学校に来ていたAlex から届いたメール です。これを読んで, 問1~問3に答えなさい。 *印のついている語句には、本文のあとに〔注〕があ ります。 (12点) Hello. How are you? Last month, I found a nice new shop near my house. The shop * sells many things from Japan. I bought a beautiful *postcard. The owner of the shop said that the picture on the postcard was taken in Kyoto. The owner's name is Meg. She's very good at Japanese. I said, “Your Japanese is She lived in your town when she was a good!" I was surprised at her answer to that. child! I showed her some pictures of the town. You know I took a lot of pictures when I was in Japan. Meg looked at one of them and said, “I love this picture!" I took that one at the summer festival in your town. She has never visited Japan, but she says she My sister Lisa likes that picture, too. wants to go to some festivals there *someday. We're going to have Lisa's birthday party this weekend, so I'll buy a birthday present for her at Meg's shop. What should I give her if I buy something from Japan ? 〔注〕 sell ・・・・・・ ~を売る postcard・・・・・・ はがき 絵はがき owner・・・・・・ 持ち主 taken・・・・・・ take の過去分詞 (be) good at ~・・・・・・〜が得意である (be) surprised at ·······〜に驚いて never......一度も〜ない someday・・・・・・いつか 問1 Alex が,近所に新しいすてきな店を見つけたのはいつですか。日本語で書きなさい。(3点) 8問 問2 本文の内容と合うものを、次のア~エの中から1つ選び、その記号を書きなさい。 (3点) Alex は Meg の店できれいなはがきを3枚買った。 Meg は大学生のころ、 日本に住んでいた。 Hinds grivbile level bed! ウ Alex は日本にいたころ、あまり写真を撮らなかった。 medi エ Meg が気に入った写真はLisa も好きな写真だった。 ooods won! boy by mad 「おく 問3 下線部について、あなたはAlex に, Lisa に日本のものを贈るなら何がよいかについて紹介する メールを書きます。 〔条件〕にしたがい、 A に3文以上の英文を書いて, メールを完成させ 30150b 18572 is as 912 000 1 vou なさい。(6点) メール Hi, Alex. Thank you for your e-mail. A 22817 I hope you will have a good time at the party. Say hello to Lisa. らん [条件] ① 1文目は,何を贈ればよいかということを, You should に続けて解答欄の①に書き なさい。なお, Meg の店に置いてあるかどうかは考慮しなくてかまいません。 2文目以降は、その理由が伝わるように, 2文以上で解答欄の② に書きなさい。 (以上で問題は終わりです。)

解決済み 回答数: 1