(3)です。どうして△ABHは直角三角形と分かるんですか？

下の図で,3点 A, B, C は円 0の周上, 点 Dは円0の内部の点であり, △OAB, △BCD は正三角形である。線分 BD の延長と円0の |8 E 交点をEとする。 次の(1)~(3)に答えなさい。 (1) ZEAD=18° のとき, ZADE の大きさを求 めなさい。 (2) AABD=△OBC であることを証明しなさ A B い。 AB=V21cm, BC=6 cm のとき, 2点A, Cを結ぶ線分 AC の長さを求めなさい。

この計算ができませんm(*_ _)m

IC の め Ic。 1 (2x+9)(9-x)=45 を解くと, x =3, 316 2 5 0<xく 3

連立方程式の応用です わかる方いたら1問でもいいので解説とともにお願いしますm(_ _)m 表とかは間違っている可能性ありなので気にしないでください。

*ノートに解いて、答え合わせをしよう。 * まちがえた問題番号には赤ペンで×をつけておこう。 Try 次の問いに答えなさい。 (1) Aさんは,家から2400m離れた学校に通学している。最初は分速60mで歩いていたが、途中か ら分速150mで走ったところ,全体で31分かかって学校に着いた。歩いた時間と走った時間を それぞれ求めなさい。ただし、, 歩いた時間をェ分, 走った時間をッ分として、.その方程式と計算 過程も書くこと。(鹿児島) 200 m り 31分 (2) ある中学校の昨年度の生徒数は230人であった。今年度の生徒数は, 昨年度と比べ,男子が 10%増え,女子が5%減り, 全体で5人増えた。昨年度の男子,女子それぞれの生徒数を求めな さい。(秋田) E×ercise *ノートに解いて、答え合わせをしよう。 *まちがえた問題番号には赤ペンで×をつけておこう。 次の問いに答えなさい。 (1) サクラさんは, スタート地点からA地点, B地点を経てゴール地点まで,全長3kmのコースを走っ た。スタート地点からA地点までは分速150mで8分間走り, A地点からB地点までは分速 120mで走った。そして, B地点からゴール地点までは分速180mで走ると,スタートしてから ゴールするまで22分かかった。このとき,次の問いに答えなさい。〈佐賀) DA地点からB地点までの道のりをrm, B地点からゴール地点までの道のりをymとして,エ, yについての連立方程式を次のようにつくった。このとき, ア, イにあてはまる式を求めな 「5 720 さい。 ス 1200m A B y 3000mm ア =3000 - 1 200m (分 I50m g120n 8分 15EUM イ =22 21分 ② A地点からB地点までの道のりと, B地点からゴール地点までの道のりを,それぞれ求めな さい。 (2) ある家庭では, 昨年1月の電気代と水道代の1日当たりの合計額は530円だった。その後, 家 で節電·節水を心がけたため, 今年1月の1日当たりの額は, 昨年1月と比較して電気代 15%, 水道代は10%減り, 1日当たりの合計額は460円となった。次の問いに答えなさい。〈兵 の昨年1月の1日当たりの電気代と水道代をそれぞれ円, y円として, 連立方程式をつくっ アとイにあてはまる数式を書きなさい。 ア=530 イ=460 2昨年1月の1日当たりの電気代と水道代はそれぞれ何円か, 求めなさい。 .2年生の範囲O(数式)

ケニアの森林が減った理由について、 30字いないで答えなさいの問題で私は ケニアに住む人が増え土地を覆っていた木を伐採したため。 とかにました。ピンになりますか??

|2 次の英文は, ワンガリ ·マータイ (Wangari Maathai) さんと, グリーンベルト運動 (the Green Belt number of people who lived there.. It wasincreasing every year. More people were cutting down the trees which covered_the land, They used them for *firewood when they cooked food So the forests in Kerya cannot get the firewood they need either. Forests also give food to many kinds of animals. They save the bare. The bare land cannot hold water, and cannot produce enough vegetables for the people. The people (anc Forests can hold a lot of water. If the trees in forests are cut down, the land becomes Maathai wanted to protect the forests in Kenya. She had an idea to make a group of people to plant trees. 第3回 cOvered こあかり Movement)について書かれています。各問いに答えなさい。 When she went back to Kenya, she got a shock. One of the *causes was the studied *biology in the U.S. when she was a young woman. In those days, the forests in Kenya were becoming smaller year after yeau 5 became much smaller while she was abroad. lives of people and animals. Soforests are very important. 10 She founded the Green Belt Movement in Kenya in 1977, She began to plant trees in order to prouet forests. There were many women working on the farms in villages in Kenya. They were very pooL, anat children were always hungry. They couldn't take good care of their children. Some of the children cou go to school. So Maathai wanted these women to join the Green Belt Movement. She began to work 15 the women. She *paid some money for their work. The money given to them wasa big help to make lives better. And that helped to make their children happier than before. At the same time, Maathai the women many things, such as how to read and write. They also learned that they could do somethin

どうしたら過程になるか分かりません

1 (1) 19×21+20-40×19+19 (20-1)(20+1)+(20-19) ミ 皆販合舗 「学 : 400-1+1 ニ = 400 ニ 400

日本が貿易を行うようになってからの輸出品、輸入品の移り変わりについて教えていただきたいです😭🙏🏻

この英作文の添削をお願いします💡💡💡

【指示】 4文以上の英文で,まとまりのある内容になるように書くこと。 人や社会とのかかわりの中で、「うれしかったこと」または「やってみたいこと」を書 くこと。 それぞれのテーマは次の書き出しで始めること。なお,書き出しの英語も解答欄に記入 すること。 I was happiest when I really want to 選んだテーマの記号 [(8 volunteer in the. nant fo V of For lesenpleydeaning. futute てん:ldren learm Engik,and many children a beach 「ァ。 help theme すぐチ I kant Ti hel foww Sutay 5 VO in heed. Ithik I Can po uro

高校入試問題の数学の問題です！ （3）を全部代入する方法しか私は分からないのですがそれをするとテストの時間が無くなるので簡単にできる方法を教えてほしいです🙏 解答を読んでもよく分からなかったです😭 一枚目が質問、二枚目が解答です💦

12 次の各問いに答えよ。 (1)2つの関数y = az?, y =- 2c - 4について, 2の変域が-2<c< じになるという。 このとき, aの値を求めよ。 ( (2) /ある兄弟の現在の年齢の和は 30であり, 3年後は2人の年齢の比が の兄の年齢を求めよ。( 歳) 12 が整数となるような自然数nをすべて求めよ。 ( V2n (4) 次の3つの関数 a y = ……………ア, y = a.r + b…イ, y= ba + a… ウ のグラフとして適するものを下の0~6から1つ選び, その番号を答

過去問なんですが答えを貰っておらず分からないので教えてください よろしくお願いします

9 次の英文を読んで、後の問いに答えなさい。 Naln was an 'exchange student from *Tndonesia at Minami High School. Her class was going to nave class activities about Indonesia Nani was asked to introduce some games to play. She thought, “I have an idea. I will introduce a game like Japanese janken. One day after school, Nani was on her way home. It began to rain. She was lucky because she was carrying her pink umbrella with her. She went to a convenience store to buy some "snacks. She Ctered the store and put her umbrella near the door There were some other umbrellas there. When she was looking for some snacks, she saw a tall girl. The girl went out through the door. Nani bought some "pieces of bread and a *pack of orange juice. She found one pink umbrella near the door, but it wasn't hers. She said to herself, "Someone has taken( ). Nani said to the Clerk, "T can't find my umbrella. I put it here but " The clerk thought "for a while and said, "1 guess my daughter, Kumiko, took yours "by mistake. Our shoD is very small, and our “family members Sometimes use that door. Kumiko hurried to her friend's house to return a book. She will be back SOon. Nani said, "No problem." The clerk looked at her uniform and said, "Oh, you are a Minami High School student. Kumiko was a student there, too." Nani said, "My name is Nani. I'm from Indonesia." A few minutes later Kumiko came back and her mother said to her, "Kumiko, this is Nani. You took her umbrella. Both of yours are pink." Kumiko said, "Oh, I'm sorry." Her mother said, "She is an exchange student from Indonesia at Minami High School." Kumiko said, "I was a student there too. Nice to meet you. When I was a student, I was very interested in foreign countries. I wanted to have a friend like you. Did you tell your classmates about your country? Nani said, "Yes, but I want to teach them more. I'm going to introduce Indonesian janken to my classmates. I hope they will enjoy it." Kumiko smiled and said, "A game? That's interestingl I'm interested in it. I'd like to see it. Would you like to come to my room?" Nani said, They went up to Kumiko's room. Nani said, "Ill teach you a game, Suit, from my country. It's like a Japanese janken. This is how to play it. You are three "fingers, a *thumb, a “forefinger and a *little finger. A thumb means an elephant. A forefinger means a man. A little finger means an ant. An elephant is stronger than a man. A man is stronger than an ant. An ant is stronger than an elephant." Kumiko asked, "Why is an ant stronger than an elephant?" Nani answered, "An ant goes into its ear, and the elephant cannot do anything about it. The elephant feels very bad. Do you 1understand?" Kumiko said "Yes, I do. I think it is not difficult to understand this game." Nani was glad to hear that. They played it together. After the first game, they tried it again. Kumiko won the second game. They tried it many times. They had a good time. Kumiko said to Nani. "Thank you for teaching me such an interesting game. Im sure your classmates will be excited too." Two days later, Nani's class had class activities. When Nani introduced the game to her classmates, they were interested in it. I hey enjoyed playing it many times. They had a great time. (注*) exchange student 交換留学生 Indonesia インドネシア snack 軽食 piece 一切れ pack パック for a while しばらくの間 by mistake 間違って family member 家族 thumb 親指 forefinger 人差し指 little finger 小指 finger 指

一応解いたのですが、合っているか分からないので教えてください！

|5 次の英文を読んで, 1, 2, 3, 4の問いに答えなさい。 r Do you like dogs? Today, a lot of people have dogs. In Japan, in 2020, about 8,500,000 dogs lived with people. Dogs are the first animal people *kept, Then, when did people start to live with dogs? Some people think *humans started to do it about 15,000 years ago. *In those days, dogs were useful when people wanted to *hunt animals because dogs could the *smell of animals. When A dogs helped people, they gave them some *bones or *meat after *killing an animal. In this way, people had a good *relationship with dogs. Today, there are not so many people who hunt animals with dogs *as before. But dogs stil help people in other ways. For example, they help us as guide dogs or as hearing dogs. Guide dogs can help people who can't see things wel1. Hearing dogs help people who can't hear *sounds and voices well. If you go to *farms in Australia, you'll see dogs working with *shepherds to *control the *sheep. These dogs are people's good *partners. In *modern cities, T but some people still keep dogs. This is because dogs are not い B only useful animals but also our friends. [注) *human(s) =人間 *hunt =狩る *kept = keep(飼う)の過去形 *smell =におい *in those days =当時 *killing) =殺す *sound(s) =音 *bone(s) =骨 *meat =肉 *farm(s) =農場 *relationship =関係 *shepherd(s) =羊飼い *partner(s) =パートナー *as before =以前のように *control =管理する *sheep = sheep(ヒツジ)の複数形 rOne *modern =現代の rt 80 orl armond o 1 本文中の に入る語として,最も適切なものはどれか。 no02 amimom yal O A ア follow イ hit エ write bnn i ada noom sbear/T' mo omor Jog Bae ウ change he 2 下線部のイヌはどのようなことができるか。具体的に日本語で書きなさい。 3 本文中の B に入るものとして, 最も適切なものはどれか。 ア dogsare more useful than cats イ dogs are not difficult to keep ウ dogs are not as useful as before エ dogs are very popular 4 本文の内容と一致するものはどれか。 ア In Japan, in 2020, more than 9,000,000 dogs lived with people. イ Some people think humans started to live with dogs about 15,000 years ago. ウ There are many people who hunt animals with dogs now. エ People should keep dogs more because they help peoplealot.