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数学 高校生

(3)で、マーカーを引いてあるところがよくわかりません。 特に、2-αのところです。

302 隣接3項間の漸化式 (3) 2辺の長さが1 と2cmの長方形のタイルがある.縦が2cm,横が ncm 1 の長方形の場所をこれらのタイルで過不足なく敷きつめるとき,そ Check のような置き方の総数を an で表す. ただし, nは正の整数である. (1) a1,a2 を求めよ. (3) {an}の一般項an を求めよ. 枚置くかで2通りに分け られる.これより,n+2/ までのタイルの置き方は、 +2=an+1+an となる. (2) An+2 An+1, an £¶v›¯‡t. タイルの置き方を具体的にイメージしてみる。 のタイルをA.のタイルをBで表すと, 2までタイルを置いたとき, 一番右端のタイルの置き方は, Aを1枚置くか,Bを2 (i) 2n+1 An+2 conce どうなる 720 5 (1) n=1のとき, タイルの置き方は1通りより, α=1 あとは確定 0-1+√/5, a=- 2 通り Aのダウ n+1 nn+2 B= **** n=2のとき, タイルの置き方は2通りより, a2=2 (2) 横が (+2cm のとき, タイルの置き方は、次の2 つに分けられる。 または (すでに横が (n+1) cm までタイルが置かれて(n+1)cm まで置いて いて、最後に縦に1枚置いて,(n+2 cm とする. いるので, an+1(通り) すでに横がncmまでタイルが置かれていて, 最縦に2枚並べる置き友 後に横に2枚置いて,n+2cm とする。 は(i)に含まれる. よって, (i), (i)より, an+2=an+1+an (3) 特性方程式 x2=x+1, つまり, x²-x-1=0 の2つの解を p.534 参照 1+√5 8=1-√√5 α== B= 2 2 数列{an+1- aan} は初項az-αa1=2-α,公比βの等比数列より, an+1-dan=(2-α)βn-1 また,α+B=1,B2=β+1 より, 2-α=β+1=β2 hp- an+1-αan = B2.pn-1B+L① an=a_g(an+1-βn+1) 通り Bのタイル2枚 んでおけば あとは確定 よって, また, an+2-Ban+1=α (an+1-βan) となるから,上と同様に, an+1- Ban=an+1 ·② ②① より n 10 とすると, an+2-αan+1=β(an+1- αam)となる. 1-√√5 £), an=- 2 533 ESPE 第8 *), an= // ((¹+√5) **¹-(1-√5) **) \n+1 5 2

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英語 高校生

9行目、length to beのこのto beはなんですか? 不定詞の形容詞用法なのでしょうか。 to be Cの形は見たことがありません。 教えてください🙇‍♀️

It is only when th another person that a real basis for ed. While some people can make us feel comfortable others make us feel ill at ease and some seem untrustworthy. s has to do with the length of time that they look at us or with how long hold our gaze as they speak. この内容が関係してる等位は後ろ見て、見る!!! のは手前、 Michael Argyle, a pioneer of social psychology and nonverbal communication skills in Britain, found that when Westerners and Europeans talk, their average, gaze commun time 相互に、お互い is 61%, consisting of 41% gaze time when talking 75% when listening and 31% mutual V C 10 mutual gaze was 1.18 seconds. gazing. He recorded the average gaze length to be 2.95 seconds and the length of a We found that the amount (of eye contact) in a typical conversation ranges from 25% to 100%, depending on who's talking and what culture (2) AL'X they're from? When we talk we maintain 40 to 60% eye contact with an average of 注目すべき 80% eye contact when listening. The notable exception to this rule is Japan and some Asian and South American cultures, (where extended eye contact is seen as aggressive 15 or disrespectful. The Japanese tend to look away or at your throat, which can be A *disconcerting for culturally inexperienced Westerners and Europeans. Argyle found that when person A likes person B, he will look at him a lot. This 1 1:1 him 21

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英語 高校生

1番のところの答えが欲しいです丸つけします🙇🏻‍♀️できるだけ早くお願いします

10 15 3 experimenting with music. Scientists in an English university are They want to know what music makes customers spend money. What they did was to play different kinds of background music in a restaurant. They watched carefully and recorded what happened. They found that customers spent 22 pounds on average when However, if they played soft, classical music, customers spent over 24 pounds. That's 10 percent more! they played pop music. "According to our research, music does affect people's moods. Classical music makes customers feel rich and sophisticated," says 10 Dr. Adrian North from the University of Leicester. "They then buy luxury items, such as appetizers, desserts and coffee." Interestingly, if there was no background music, the customers spent only 21 pounds on average. They spent less because they skipped some of the luxury items. 5 レストランや喫茶店では音楽を流していますね。 あの音楽によって売上に変化はあるのでしょうか。 の科学者が実験を行いました。 その結果は... POINTS James Davis owns the restaurant where the scientists carried out the research. "Sometimes I play what I like, not what the customers like," he says. "After the research, I'll be more careful. I'll use less pop music! Classical music is what I should play." [東京家政大〕 ). ✓ fewer 7 no (5) In the future, James will play more ( 7 pop 1 jazz イギリス ). more scientist 科学者 experiment 実験をする ) music. customer 客 classical spend 使う on average 平均して ☐ 1 本文の内容に合うように,次の (1)~(5) の()に入る最も適切な語句をそれぞれア〜エか ら選びなさい。 (1) The scientists carried out the experiment in a ( 7 university restaurant concert hall (2) They played various kinds of ( 7 games 1 roles (3) Customers bought more ( 7 salads 1 desserts (4) Customers bought ( research 研究 affect 影響する sophisticated 高級な luxury ぜいたくな when they heard classical music. gifts I department store ) luxury items when there was no music. I bigger background music I musical instruments 29 I main courses 2 I rock アエ イ ウエオ 3 (1 0

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