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数学 高校生

2つの解なのにD>0としないのはなぜですか? あと②③で≧0をつけるのがよくわかりません。教えてください🙇‍♂️

82 0000 基本例題 49 2次方程式の解の存在範囲 (2) xについての2次方程式x(a-1)x+a+6=0 が次のような解をもつよう $HOO な実数aの値の範囲をそれぞれ求めよ。 (1) 2つの解がともに2以上である。 (2) 1つの解は2より大きく、他の解は2より小さい。 x2-(a-1)x+a+6=0 の2つの解をα, β とし, 判別式を Dとすると 解と係数の関係により D={-(a-1)}2-4(a+6)=α²-6a-23 α+β=a-1, aβ=a+6 (1) α≧2,β≧2 であるための条件は,次の ①,②,③が同 時に成り立つことである。 D≧0 CHART & SOLUTION 実数解 α, β と実数の大小 a-k, β-k の符号から考える (1) 2以上とは2を含むから、 等号が入ることに注意する。 a≥2, B≥2 ⇒ (a−2)+(B-2) ≥0, (a-2)(B-2)≥0] (2) a<2<ß †l B<2<a ⇒ (a−2)(B-2)<0S8+5+x(6-0)5+ 解答 (x-2)+(B-2)≧0 (a-2)(B-2) ≥0 ①から a²-6a-23≥0 ゆえに a≦3-4√2,3+4√2 ≦a (4) ②から ① a+B-4≥0 ゆえに a ≥5 ・・・・・・ (5 aß-2(a+B) +420 よって ③から ゆえに a+6−2(a-1)+4≧0 ④,⑤, ⑥ の共通範囲を求めて 件は よって α+6−2(a-1)+4<0 P RACTICE 49 (a-1)-4≧0 3+4√2 ≦a≦12 (2) α<2<β または β<2<α であるための条 (a-2)(B-2)<0 CECONNA よって a≦12... ⑥ 3-4√2 これを解いて a>12 80 p.76 基本事項 5,基本48 , inf. 2次関数 f(x)=x²-(a-1)x+a+6 このグラフを利用すると (1) D≧0, 10 O ( 軸の位置) ≧2, ƒ(2)≥0 0 EF(2) a-10 2 (2) f(2)<0 (p.76 補足参照) 5 x 5 3+4√2 12 このとき, D>0は成り 立っている。 (p.754 解説参照) ED (

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英語 高校生

和訳お願いします。

次の英文を読んで, 設問に答えなさい。 [5] The headline grabs your attention: "The ancient tool used in Japan to boost memory." You've been The Japanese art of racking up clicks online more forgetful recently, and maybe this mysterious instrument from the other side of the world, no less! could help out? You click the link, and hit play on the video, awaiting this information that's bound to change your life. The answer? A soroban (abacus). Hmm, () それは私がどこに鍵を置いたか覚えておく助けになりそうには ないですよね? This BBC creation is part of a series called "Japan 2020," a set of Japan-centric content looking at various inoffensive topics, from the history of Hiroshima-style okonomiyaki pancakes to pearl divers. The abacus entry, along with a video titled "Japan's ancient philosophy that helps us accept our flaws," about kintsugi (a technique that involves repairing ceramics with gold-or silver-dusted lacquer), cross over into a popular style of exploring the country: Welcome to the Japan that can fix you. For the bulk of the internet's existence, Western online focus toward the nation has been of the "weird Japan" variety, which zeroes in rare happenings and micro "trends," but presents them as part of everyday life, usually just to entertain. This sometimes veers into "get a load of this country" posturing to get more views online. It's not exclusive to the web traditional media indulges, too but it proliferates online. Bagel heads, used underwear vending machines, rent-a-family services - it's a tired form of reporting that has been heavily criticized in recent times, though that doesn't stop articles and YouTube videos from diving into "weird Japan." These days, wacky topics have given way to celebrations of the seemingly boring. This started with the global popularity of Marie Kondo's KonMari Method of organizing in the early 2010s, which inspired books and TV shows. It's online where content attempts to fill a never-ending pit - where breakdowns of, advice and opinions about Kondo emerged the most. Then came other Japanese ways to change your life. CNBC contributor Sarah Harvey tried kakeibo, described in the headline as "the Japanese art of saving money." This "art" is actually just writing things down in a notebook. Ikigai is a popular go-to, with articles and videos popping up all the time explaining the mysterious concept of ... having a purpose in life. This isn't a totally new development in history, as Japanese concepts such as wa and wabi sabi have long earned attention from places like the United States, sometimes from a place of pure curiosity and sometimes as pre-internet "life hacks" aimed making one's existence a little better. (B) The web just made these inescapable. There's certainly an element of exoticization in Western writers treating hum-drum activities secrets from Asia. There are also plenty of Japanese people helping to spread these ideas, albeit mostly in the form of books like Ken Mogi's "The Little Book of Ikigai." It can result in dissonance. Naoko Takei Moore promotes the use of donabe, a type of cooking pot, and was interviewed by The New York Times for a small feature this past March about the tool. Non- Japanese Twitter users, in a sign of growing negative reactions to the "X, the Japanese art of Y" presentations, attacked the piece... or at least the headline, as it seemed few dove the actual content of the article (shocking!), which is a quick and pleasant profile of Takei Moore, a woman celebrating her country's culinary culture. Still, despite the criticism by online readers, the piece says way more about what English-language readers want in their own lives than anything about modern Japan. That's common in all of this content, and points to a greater desire for change, whether via a new cooking tool or a "Japanese technique to overcome laziness." The Japan part is just flashy branding, going to a country that 84% of Americans view positively find attention-grabbing ideas for a never-ending stream of online content. And what do readers want? Self-help. Wherever they can get it. Telling them to slow down and look inside isn't nearly as catchy as offering them magical solutions from ancient Japan.

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英語 中学生

この文章にある高校受験までの範囲で重要な表現や、文法事項、などピックアップして頂きたいです! 見にくい上に多くて大変だと思いますがよろしくお願いします。 もしよかったら近畿大学付属高校の英語でおさえておきたいことがあればぜひ教えてください

時間 50分 配点 100点 次の英文は、飛行機に乗ることに対しての恐怖に関する講座について書かれたものです。 英文を 読んで、後の問いに答えなさい。 Fear of flying is a common problem. One study shows that 20 percent of us feel afraid about airplane flight. Is it possible that taking a class can help? I am sitting with my wife, Cathy, who is afraid to fly, and 120 people in a hotel near a busy airport. Dr. Brian Kelly and 15 other experts are taking us through a one-day fear-of-flying class. In the morning, Pilot Richard Smith gives a clear explanation of how an airplane (), and talks about the parts of a flight that cause the most fear. Sudden movement of the plane is the biggest problem. It's not relaxing, but common, and Smith explains how planes are (v) to *deal with it. The afternoon class deals with mental problems. Like many other strong fears, fear of flying is caused by “catastrophizing" - thinking too much about *disasters. The simplest solution, says Kelly, is mental training: Simply stop yourself. When you find that you imagine something bad, think about (1) something pleasant. If you do it often enough, the fear will become ( A ). Everyone is thinking about the 40 minutes flight at the end of the day. The question is, who will be on the plane? There are (B) levels of fear in the group. Some people are a little nervous, others very afraid. lisampu Margaret Anderson is somewhere in the middle. She has () on a plane many times, but her fear has grown with each trip. It's a surprisingly common problem: People remember every moment of bad feeling during years of flying, but they ( C ) the peaceful trips. (2) As a result, they imagine the bad situation. "I went to Bali and spent two weeks staying on the beach," says Margaret. "It sounds like fun, but it wasn't. I spent the whole time looking up at the planes, terrified when I thought I'd have to fly to get home." This is the second class for David Green: The first time he couldn't leave the hotel [ X ] the airport. He's a big man, and doesn't want to show fear, but ( D ). "I want to go to *Majorca for a vacation with my family, but right now I just can't. And I have (3) one thing to worry about," he says. "The worst thing is that I have to tell my fear to my son, Daniel." Toward the end of the afternoon, the stress is rising. It's almost time for the flight. My wife is *pale, but relatively calm. 1 fear ウ overcome オ I ' it's / the other people # (4) [7 hard fór they had and talk about the fear smaller in tears is having a terrible panic attack. People They tell passengers the reason for every "thump, clunk, and so on. ow different feelings in the plane. Everyone is invited to spend a minute with the pilots. ally helped. I was much more relaxed." When we arrive, most passengers are smiling. Margaret Anderson is happy: "(6) It has David Green stepped man who needs a vacation. on and [Y] the plane one time too many and stayed in the 注) *deal with 〜に対処する boarding area. "Next time," he says. "I'll go next time." I hope he (7) does. He looks [Z] *pale (顔が) 青白い *thump, clunk 文中の空所(あ)~(う)に入る語を下から選んで、それぞれ適切な形に直して入れなさい。 get PR い。 *disaster ) ( ) *Majorca マヨルカ島 build take fly 下線部(1) とほぼ同じ意味で使われている英語を本文中より抜き出し、 一語の英語で答えなさ 文中の空所 (A) に入る最も適切な語を,次のア~エから一つ選んで記号で答えなさい。 7 common 1 weak well I nervous 間 4 文中の空所(B)に入る最も適切な語を、次のア~エから一つ選んで、記号で答えなさい。 7 same different high I hard 文中の空所(C)に入る最も適切な語を,次のア~エから一つ選んで、記号で答えなさい。 7 remember feel forget I take 問6 下線部(2) とほぼ同じ意味を表す語句を、次のア~エから一つ選んで記号で答えなさい。 In fact For a while At first I In the end B7 文中の空所 [ X ] ~ [ Z ] に入る最も適切な語を,次のア~エから一つずつ選んで、記号で 答えなさい。 X ) X( ) Z( ) 7 like 1 off from I for 8 文中の空所 (D)に入る最も適切なものを、次のア~オから一つ選んで、記号で答えなさい。 7 he feels relaxed at the airport 1 he doesn't worry about his vacation

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数学 高校生

(2)はなぜ7以下になるのですか?また、7も含んでいいのはなぜですか?

54 EX 000000 基本例題 31 1次不等式の整数解 (1) 不等式 6x+8 (4-x) >5 を満たす2桁の自然数xをすべて求めよ。」 (2) 不等式5(x-1)<2(2x+α) を満たすxのうちで、最大の整数が6であ るとき,定数aの値の範囲を求めよ。 CHARTO SOLUTION 1次不等式の整数解 数直線を利用 まずは、与えられた不等式を解く。 (1) 不等式の解で,2桁の自然数であるものを求める。 (2)不等式の解が,x<A の形となる。 ここで, x<Aを満たす最大の整数が6 であるということは, x=6 は x<A を満たすが, x=7 は x<A を満たさないということ。これを図 に示すと右のようになる。 解答 (1) 6x+8(4-x) >5から -2x>-27 27 ゆえに =13.5 2 xは2桁の自然数であるから 10≤x≤13 x=10,11,12, 13 よって むく (2) 5(x-1)<2(2x+α) から x<2a+5 ① ①を満たすxのうちで最大の整数が6となるのは 6<2a+5≤7 のときである。 ゆえに よって 1 <2a≦2 <a≦1 14 10 11 12 1313.5 (1) 2桁 6 日 最大がらなんやけ 2a+5 7 Qa+5はりより付①を満たす最大の整数 ないといけん x x 6 A 7 x ◆展開して整理。 基本28 不等号の向きが変わる。 dok 100 [S] ◆解の吟味。 ■展開して整理。 [E] 6<2a+5<7 とか 6≦2a+57 などとし ないように等号の有無 に注意する。 a=1のとき, 不等式は x<7で、条件を満たす。 Okt

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