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Mathematics Senior High

この問題の(1)の解答の「x²の係数が1で正であるから」のところなのですが、この条件がないと判別式Dが0未満になるという条件を使えないのでしょうか?理由も教えて欲しいです!

常に ax°+bx+cS0→a<0, D<\ 180 基本例題113 絶対不等式 (1) すべての実数xに対して, 2次不等式r+(k+3)xーk>0z 定数をの値の範囲を求めよ。 基え 0S の 立っ うス D.171 基本事項6 「演習129、 数aの値の範囲を求めよ。 指針 指針> 2次式の定符号 2次式 ax+bx+¢についてD=6°-4ac とする。 常に ax'+bx+c>0→a>1, D<0 常に ax+bx+cく0→a<0, D<0 (1) の係数は1(正)であるから, D<0が条件。 (2) 単に「不等式」とあるから, a=0(2次不等式で ない)の場合とaキ0の場合に分ける。 補足 ax'+bx+c>0に対して, a=0の場合も含め ると,次のようになる。 常に ax'+bx+c>0→=b=0, c>0; または a>0, D<0 常に ax°+bx+cハ0 la<0, n) n C 【a>0, D<0] [a<0, D<0 解答 (1) xの係数が1で正であるから, 常に不等式が成り立| つための必要十分条件は, 2次方程式 x°+(&+3)xーk=0 の判別式をDとすると D=(k+3)°-4-1-(ーん)=k°+10k+9=(k+9)(k+1) であるから, D<0より (k+9)(k+1)<0 「すべての実数 x」または「任意の実 数x」に対して不等式が成り立っと は、その不等式の解が,すべての実 数であるということ。 (1)のD<0は,下に凸の放物線が常 にx軸より上側にある条件と同じ。 D<0 ゆえに -9<kく-1 ACarcet,

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English Senior High

わからないので教えてください

(レポート課題) 英文をよみ、下の問いに答えなさい。 Color can affect human mood. We have known this for a long time. Ancient Egyptians and Chinese used different colors to help sick people. No one really knows if it worked or not. But we can see today that people still think that the effect of color is important. The simplest example is the way people choose colors for their rooms. Another example is the color choice for company products. We also consider the color of clothes very carefully when we decide what to buy. Many people believe that red has a high energy level. They feel that it is connected to speed, danger, excitement, and passion. It is a good choice for a fast car, but not s0 good for a doctor's office. In that kind of place, a soft blue is thought to be better. Blue is a color that seems to help people to feel calm. In contrast to this, yellow creates feelings of happiness and cheer, and it is often used in kitchens 問 問 and bathrooms But nothing is really quite so simple. Research shows that some people get angry 問 more quicky in a yellow room. Babies seem to cry more, too. And even a soft blue, which is usually relaxing, can also make some people have sad feeling. Finally, it is important to remember that the effects of color on human mood don't alwayslast along time. In fact, the effect is usually relatively short. For example, a soft blue room may help people feel calm at first, but the effect disappears fairly soon. 問1 第2、第3段落の筆者の言いたいこと (筆者の主張) は何か。 簡潔に要約しなさい。 第1段落 色は人間の気持ちに影響を及ぼすことがある 第2段落/( 第3段落 /(名人種に対する

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English Senior High

問3について ④みたいな選択肢のとき、ついついwhenを 「~とき」と訳してしまいます。 模範解答は「いつ、他者のそばに立つべきか」と書いてあったのですが、なぜこのときはwhenを「いつ、~」と訳してるんですか?どういうときに「いつ」と訳せばいいんでしょうか? あと、「~... Read More

第6問(配点 24) A findings to your classmates. social positions. Personal Space and Culture Hall also told an interesting story illustrating cultural influenee, He was Sitting alone on a chair in the lobby of a hotel when an unfamiliar Arabian man came within arm's length) The man looked as if he was waiting for someone and stood in front of than an Asian person. strangers. him. Due to his personal space being violated, he felt very uncomfortable and tried to show his discomfort, but the Arab did not seem to notice at all) Hall had no idea why the man was standing so close, thinking that even in a public place like a hotel lobby, someone's personal space should be respected by others. Afterward, when he 0 taik with your friends even when thev are closer than this distance. However, you met his Arab friend, Hall asked why the man had acted so rudely. His friend said, “That's just an American idea. Arabs believe that personal space does not exist for anyone in a public place like a hotel lobby." Furthermore, a distance of less than 1.5 feet (46cm) from you is called *“intimate In a globalized society, knowledge of cultural influence on interpersonal distance aistance." Since physical contact with others is likely to occur within this distance, is necessary in daily life/ People from different cultural backgrounds have a personal only those who have a very close relationship with you are allowed to come nearer space of a different size, and it is very likely that you will mistakenly violate their than that. By contrast, when you step into a stranger's space formed by intimate personal space. This may sometimes cause(serious trouble, Therefore, understanding distance, they may feel that you are trying to frighten them or physically attack them. the sense of interpersonal distances in other cultures will help avoid conflict with Hall classifies “personal distance” and “intimate distance” as someone's personal others. space. The space outside of your personal space can also be divided into two types, depending on the distance./ A distance of between 4 feet (1.2m) and 12 feet (3.7m) from you is called “social distance," and a distance of more than 12 feet away from you is called"distance." in non-situations, in business or parties, place at a social . On the other hand, a public distance is a public speech. You also to keep this distance when meeting people in important The point here is that , , the same for all , but are by your or, , by the culture you belong to. , that people in South , in , space than people in Asia, a South will allow a to get closer 3- 31 3- 30

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English Senior High

2人の意見の文章からレポートをつくるときのタイトルは1人の意見だけについてのタイトルでもいいんでしょうか?? この問題では解説には2人目が日本人女性の話してるからとありますが、1人目も日本人女性の話軽くしてますよね。もし1人目の人が日本人女性の話してなくてもレポートのタイ... Read More

You are doing research on people's sleeping habits. You found two articles. Japanese women sleep less than 7 hours each day. For some people, that might be enough, but for many others, it could cause some problems in the sleep a little more than eight hours and a half on average, which seems It looks like people in my Country are doing fine. Both men and women Around the globe, the amount of sleep that people get every night has long run. Japanese people, especially women, would need more sleep. 50 第4問 (配点 16) o 第2回 実戦問題 51 Average time per day spent sleeping in selected OECD countries plus China, as of 2016 How Long Do Peopleinthe World Sleep? by Kim 9:0 9:00 9:30 8:52 8:38 8:33 8:26 July, 2018 9:00 8:30 been steadily decreasing since the 1970s. Many believe that the w technology has contributed to that decline, since it frequently disrupts o 第 8:00 7:367:52 ■Women 7:30 ロMen sleep. The graph below shows the average sleep time for men and womon 7:00 in five countries. 6:30 One noticeable point about the graph is the length of sleep for Chinese people. No one around me sleeps more than nine hours a day, except for 6:00 China USA Australia France Japan small children. How can they sleep so long? One possible explanation could be that the ratio of people working in the primaryindustry in China is very high (27.0%). Those of the other countries are between 1.4% (USA) and Opinion on “How Long Do People in the World Sleep?" 3.4% (Japan), according to the International Labour Organization (ILO) statistics. People doing physical labor might need more sleep. by Yoshimi Ito August, 2018 As Kim mentioned, Japan has to deal with the problem of short sleep. Japan shows a marked contrast to China. Japanese men sleep one hour and eight minutes shorter than Chinese men and Japanese women sleep However, that is not all. As the graph shows, women in our country sleep bour and 28 minutes shorter thanChinese women, It may not be a big sixteen minutes less than men. We should address the issue of gender gap, deal if all Japanese women slept more than seven hours and 36 minutes. Dt this “seven hours and 36 minutes 1S the average, which means a lot of too. One thing I would like to point out here is that Japanese men spend much less time on housework than women. In 2011, women spent three hours and 45 minutes a day on housework (care for household members plus routine housework) while men spent just 31 minutes, according to OECD data. It is common to see wives who work full-time do most of the housework as well. The sad truth is that there are still many men who quite appropriate to me. seriously believe that housework mustbe done by women. We might have LO start by making them change this kind of mentality. n my opinion, two things are certain. First, many Japanese are not deal with these problems right away. 無2回

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English Senior High

430で、④が不正解な理由を教えてください。 (答えは③です。)

I had scarcely sat down to read a book ( b aerd ) the telephone rag さ用水 ) as she waS recovered. 6 such Theme|111 We began to walk again as ( 2much The の long 口427 基本 頻出 (3) SOon Owell as 1428 子供は,母親が部屋に入ってくるのを見るとわっと泣き出し 現合0om 427 oH Oイ | M8S moment) the room. 1429 君が出て行けと言えば, すぐに出て行くよ。で Iwill go away (directly / me / tell / to / you). ) the cottage when it began to rain. 2 do we reach epe apto 1on 428 (東京理) 30 Hardly ( 頻出 T 1 did we reach TO の have we reached (慶力 3 had we reached the telephone man Toe T | 431 頻出 2 than 3 after のwhen (亜細) の because 425 1432 私を見るやいなや, 彼は逃げ去った。 超頻 No(than / had/he/sooner / me / he /ran/ seen / away). T (濁協大 Power Up! 81 「~するとすぐに……」のいろいろな表し方 彼は私を見るとすぐに逃げだした。 msLoteni ont ■As soon as ロ The moment he saw me, he ran away. Directly On seeing me, he ran away. (9 133) He had hardly [scarcely] seen me when [before] he ran away. Hardly [Scarcely] had he seen me when [before] he ran away. He had no sooner seen me than he ran away. 入さ間の1ei bo 【倒置翻) No sooner had he seen me than he ram away. [倒置形」 427 (3)私たちは彼女が回復するとすぐに再び歩き始めた。 428 The child burst into tears (the moment he saw his mother enter) the roo 429 Iwill go away (directly you tell me to). 430 (3) 山小屋に着くとすぐに雨が降り始めた。 431 ()本を読もうとして座るか座らないかのうちに,電話が鳴った。) 432 No (sooner had he seen me than he ran away). boided qoiqal im orey 30日 sw 11 bnided golqs 180 Part1 文法 pp bele ロロロ ロロ口 ロロ

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