(2)赤で囲った所がわかりません。😢 なぜ、0≦θ<2πではcosθ−1≦0になるんですか？ また、なぜcosθ−1＝0と2cosθ−1≦0という不等号になるんですか？ 教えてください

基本例題150 三角方程式・不等式の解法 (3) 002 のとき,次の方程式、不等式を解け。 (1) sin20=coso 倍角の公式 0000 (2) cos 20-3cos 0+2≧0 基本149 指針 2倍角の公式 sin20=2sin0cos 0, cos20=1-2sin' 0=2cos' 0-1 を用いて, 関数の種類と角を0に統一する。 ② 因数分解して, (1) なら AB=0, (2) なら AB0 の形に変形する。 [3] -1≦sin0≦1, -1≦cos0≦1に注意して, 方程式・不等式を解く。 CHART 0と20が混在した式 倍角の公式で角を統一する 解答 1 (1) 方程式から 2sincos0 = cose ゆえに よって cos (2 sin 0-1)=0 cos0= 0, sin0= 0≦02πであるから GO T -1 12 y. 1 ● 10/50 π 6 -1 cos00より 0= sin/1/23より 0= 以上から、 解は 0= 272767 ラ 6' 3|25|6|2 -π π ■ (2) 不等式から 整理すると 5 2'6 2cos20-1-3cos0+2≧0 2cos20-3cos 0+1≧0 3 π, 2 ゆえに (cos 0-1)(2 cos 0-1)≥0 00 <2πでは, cost y 1 5-6 sin20=2sin Acoso π 種類の統一はできないが, 積=0 の形になるので, 解 決できる。 1 x AB=0⇔ A = 0 またはB=0 1 sin0=- 1/2の参考図 cos0 = 0 程度は,図がなく ても導けるように。 JJR cos20=2cos20-1 であるから cos0-1=0, 2cos 0-1≦0 |cos0-1=0を忘れない。 うに注意。 3 よって cos 0=1, cos 0≤. O 2 1 1 x なお、図は cos の 2 考図。 したがって,解は 練習 0=0, πC 0075. -1 Fax- take 002のとき,次の方程式、不等式を解け。 411

136. 120. 105. ‥‥ 15. 10. 6. 3 は階差数列だと思うんですけど、この数列の和はどうやって求めたら良いですか？？お願いします😿

9 13 15. гO -5 -4 55 JT JT -1 - 5 -14 -6 {ang 1360 G 012644-1 (on take 120.105. L15 G

2、3合っていますか？ 2 付け加えました🙇‍♀️

3 2 It's four thirty now, so let's meet at four fourty. And don't forget your umbrella because it's going to 'M to take rain, I want Cathy to talk about school life in America so? in front of the students, so will you ask her to do so

この問題の本来の並びと解くコツを教えてください。 1問だけでもいいのでお願いします🙇

2 語句を並べ替えてもっとも自然な英文を完成させ、2番目と5番目に入れるも のの記号を書きなさい。 ただし、文頭に来る語も小文字にしてある。 [各2点] 1. (1 ) ( 2 ) ( 3 ) ( 4 ) ( 5 ) ( 6 ) Japan did not work properly in France. A. the B. from C. that D. hair dryer E. brought F. I 2. I'm not sure ( 1 )(2)( 3 ) ( 4 ) ( 5 ) ( 6 ) the library before it closes. A. to D. make B. we E. can C. it F. if ) ( 2 ) ( 3 ) ( 4 ) ( 5 ) ( 6 ) on 3. This application ( 1 our smartphones into line drawings. A. pictures B. us C. taken D. enables E. turn F. to 4. I thought it difficult, ( 1 ) ( 2 ) ( 3 ), to persuade ( 4 ) ( 5 ) ( 6 ) wearing that costume. A. impossible D. out B. of E. Rick C. if F. not ) New Year's cards is becoming far ) before. 5. The ( 1 )(2)(3 )(5)(6 (4 A. of D. than B. common C. sending E. less F. practice

beをなくしたら合っていますか？2

Practice-2 キャシーは喫茶店の場所がわからなかったので、香織と駅で待ち合わせて一緒に行くことにした。香織はキャ シーに,今4時半だから4時40分に待ち合わせすることと、雨が降りそうだから傘を持って行くのを忘れないでね と伝えることにした。 あなたが香織なら, 下線部の内容を,どのようにキャシーに伝えるか。 伝える言葉を英語で書 きなさい。

並び替えが分からないです😭 わかる方お願いします

I know how you feel about the mistake, but it is (7 a 1 much ウ not I of problem).

(1、3)合っていますか？

(1)横浜駅まではどのように行けばいいですか。 How can I get to (2) 伝言をうけたまわりましょうか。 点×5= 20点 > the Yokohama station? Shall I take a message ? (3) Tシャツをお探しですか。 Are you looking for a Tshirt ? yeb blow aw

(4)合っていますか？ 15行目くらいからだと思います

次の英文を読んで,(1)~(5)の問いに答えなさい。 Takashi visited Mr. Paul in London during spring vacation. famous places in London with Mr. Paul. He stayed at Mr. Paul's house. Takashi went to some One day, Takashi wanted to visit other places near London by himself and he told Mr. Paul about it. Mr. Paul said, "Go to Brighton. The city is very beautiful, so it's Takashi read the timetable many times and he (visit) by many people." station at s He looked at the clock in the planned to take a train at 8:40 in the morning. He arrived at the He sat on a chair and looked around him. Then he felt that something was wrong/ station building. It was 9:30. 8:30. But Takashi was very surprised, so he looked at his watch, but it was still 8:30. He found an old woman and asked, She looked at her watch and answered, "It's 8:30." He was relieved. suddenly, the old woman said to him again, "Oh, sorry. It's summer time now. 7.It started yesterday, so it's 9:30 10 "Excuse me, but what time is it now ?" now.' But just then her train came, so she stopped the conversation and ⑤( get) on the train. He went to Brighton. He enjoyed the city very much. Takashi didn't understand. took the next train at 9:40 and Takashi took a train back to London in the evening. He told Mr. Paul about his conversation with the old woman at the station. Mr. Paul laughed. Takashi asked, "What's summer time?" Mr. Paul said, "We have long daytime in summer. 15 From the end of March to the end of October, we put the clock forward an hour and then back again in fall. We do it to use the daytime more usefully. There are some good points, but also some problems." Takashi thought it was interesting. Mr. Paul said, "I want you to learn more about summer time." "I will," Takashi answered. After he came back to Japan, he went to the library and read a book about summer time.

合っていますか？ 答え どうやって昔の人々がたくさんの(大きな)お寺や神社を建てたのかということ

LESSON LESSON LESSON 2 3 /20 との問いに答えなさい。 <10点> Dear Andy, How are you? Thope you are fine. 次の英文は、博 (Hiroshi) がイギリスに住む友人のアンディ(Andy) にあてた手紙である。 これを読んで、あ The weather is wonderful here in Japan now. places and saw a lot of old temples and shrines. Some of them were really big One temple was as tall as a seven-story I went to Kyoto and Nara on a school trip/ last week There I visited many building! It was built more than a thousand years ago / time ago. I was moved. I wonder how the people in the old days built them. Now I am interested in old buildings in Japan. I think it is important to take care of those old buildings for the next generation. 「 just can't believe that such big buildings were built such a long s Has anything moved you recently? Tell me about it. Yours, Hiroshi 10 (注) temple(s) 寺 seven-story 7階建ての building(s) ビル建物 believe 信じる move 感動させる (moved は過去分詞) wonder ~だろうかと思う generation 世代 recently 最近 問 京都や奈良で古い建物を見て, 博が疑問に思ったことは何か、日本語で書きなさい。 人々がどのようにして昔にたくさんの幸と神社を建てたのかという=20

(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.