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数学 高校生

なんで式変形でこうなるのか教えて欲しいです

(1) 複素数2, wに対して、不等式 [z+a]s[z]+[mr]が成り立つことを示せ. 3 絶対値,極形式(証明問題) (2) 複素数平面上で、原点を中心とする半径1の円周上に3点. i.yがある.ただし, α+β+y=0 とする. (a) 等式 |aß+By+ya|=1 =1が成り立つことを示せ. a+B+r (b) 不等式le(8+1)+8(y+1) +y (a+1)2la+8+y| が成り立つことを示せ (富山大・理(数) -後) 例えば|a|=1という条件が与えられているとしよう。このとき ( a を αで表せる) a 絶対値の条件式の扱い方 •|α/2=1であるから、 aa=1, ●α = cos0+isin0 とおく. ●|By|=kaBy|=k などという使い方がある. 絶対値の等式, 不等式の証明 してみたりしよう. そのままでは変形しにくいときは、両辺を2乗したり、極形式で表 ■解答量 (1) z=r(cos0+isin0), w=R(cosy+ising) (≧0, R≧0) とおくと, |z+w|=|(rcos0+Rcosy) +i (rsin0+Rsing) | =(rcoso+Rcos)+ (rsin0+Rsing)2 cossint) +2rk (costcosy+sinosing) +R2(cos2p+sin') =r2+2rRcos(0-9) +R2 ≦r2+2rR+R2=(r+R)2=(|z|+|w|) 2 2+w|≦|2|+|w| (2) (a) a+By+ya]-[a+8+yl① を示せばよい。 ||=|8|-|r|-1により, [a8yl-1.1. BF-1 Yy=1であるから, \aB+ By+ya] [aB+By+ya][aB+By+ya||1 \aB+By+ya|=- laby| aBy 1 + + a B ■P(z), Q(z+w) とおくと,wは PQ を表す複素数で,下図の ようになる. AOPQE |z+w| Q(z+w) 辺を考える 1001 と (1) 成 立 0 || この両辺を2乗した式を示して もよいが、ここでは工夫してみる。 =1により1/27 -ly+a+B[-ly+a+ 8[-]y+a+8 したがって、題意の等式が成り立つ. (b) la(8+1)+8 (y+1)+y (a+1)=(a+by+ra)+(a+8+z)] ...) (1)で, z=aß+By+ya, w=a+β+y とおくと, ①により|2|=|w|で, ②-|z+g_n_z]+[]-[g]+[s[-2]]=2la+8+yl . \α(B+1)+B(y+1)+y (a+1)| 2|α+B+yl 3 演習題(解答は p.113 ) |2|-|za|-|za|-1 をみたす三つのに対して、+230 B=z1zz+228 とおく。 (1) =y となることを示せ. (3)の分子は (2) Y |α|=|8|となることを示せ. Z」の対称式だから、 (Z1+Z2)(22+23)(23+21) (3) z=- 212223 は実数であることを示せ. (宮城教大) B, yで表せる. 2+22α-z」 などとし よう。 100

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英語 高校生

四角IIの⑶なんでpressingなんですか 過去にしたことじゃなくないですか

EXERCISES UNIT7のまとめ いけないの。 (答 First Stage Second Stage Step 1 基本問題 別冊 p.28) Step 1 各文の( )内から最も適切なものを選びなさい。 1) I tried (to move, moving, move) that table, but it wouldn't 2) It's three o'clock now. What do you say (to take, to taken) a coffee break? 3) Please forgive me THOST First Sta move. taking, to be (not for attending, not to attend, for not attending) your lecture tomorrow. 2)に入る動詞を下の[]内から選び、適切な形にして入れなさい。 1) A: I'm really looking forward to ( B: Me, too. I can't wait. A: You should avoid )part in the race. )up late before an exam. B: I know. I'll go to bed early tonight. 3) A: This machine doesn't work. B: Try ( achine doesn the red button. 4) A: I must get up at six tomorrow morning. B: Remember ( ) the alarm clock before going to bed. [press/take/set/stay] JOJIW 3 日本文の意味に合うように,( )内に適語を入れなさい。 1)君のユニフォームはとても汚れているね。 洗濯が必要だ。 Your uniform is very dirty. It ( ) ( ) 2)昨日は折り返し電話できなくてごめんなさい。 O First Sta First Stage Second Stag I'm sorry for( ) ( ) ( ) you back yesterday. 3)妹は夜怖くて,一人でトイレに行けません。 My sister is afraid () ( ) to the bathroom alone at night. 日本文の意味に合うように,( の動詞は適切な形にすること。 )内の語句を並べかえなさい。 ただし、下線部 1)その映画はすばらしかった。 二度見る価値があるよ。 That movie was fantastic, It (twice, is, watch, worth). 2) 私たちはジュディが時間通りに来ないことに怒っていた。 We were angry at Judy (not, for, come) on time. 3)私は次に何をするべきかを言われるのは好きではない。 I don't (to, tell, do, what, like) next. First Stage AQUARIUM×ART atoa Let's write abou 230

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TOEIC・英語 大学生・専門学校生・社会人

この長文問題の答えと解説をお願いします。

15 語数: 398 語 出題校 法政大 5 We are already aware that our every move online is tracked and analyzed. But you 2-53 couldn't have known how much Facebook can learn about you from the smallest of social interactions - a 'like'*. (1) Researchers from the University of Cambridge designed (2) a simple machine-learning 2-54 system to predict Facebook users' personal information based solely on which pages they had liked. E "We were completely surprised by the accuracy of the predictions," says Michael 2-55 Kosinski, lead researcher of the project. Kosinski and colleagues built the system by scanning likes for a sample of 58,000 volunteers, and matching them up with other 10 profile details such as age, gender, and relationship status. They also matched up those likes with the results of personality and intelligence tests the volunteers had taken. The team then used their model to make predictions about other volunteers, based solely on their likes. The system can distinguish between the profiles of black and white Facebook users, 15 getting it right 95 percent of the time. It was also 90 percent accurate in separating males and females, Democrats and Republicans. Personality traits like openness and intelligence were also estimated based on likes, and were as accurate in some areas as a standard personality test designed for the task. Mixing what a user likes with many kinds of other data from their real-life activities could improve these predictions even more. 20 Voting records, utility bills and marriage records are already being added to Facebook's database, where they are easier to analyze. Facebook recently partnered with offline data companies, which all collect this kind of information. This move will allow even deeper insights into the behavior of the web users. 25 30 (3) - Sarah Downey, a lawyer and analyst with a privacy technology company, foresees insurers using the information gained by Facebook to help them identify risky customers, and perhaps charge them with higher fees. But there are potential benefits for users, too. Kosinski suggests that Facebook could end up as an online locker for your personal information, releasing your profiles at your command to help you with career planning. Downey says the research is the first solid example of the kinds of insights that can be made through Facebook. "This study is a great example of how the little things you do online show so much about you,” she says. "You might not remember liking things, " but Facebook remembers and (4) it all adds up.", * a 'like': フェイスブック上で個人の好みを表示する機能。 日本語版のフェイスブックでは「いいね!」 と表記される。 2-56 2-57 2-58 36

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英語 高校生

英語です。 二枚目の文法を使って動詞を変形させる問題です。 一問目はわかったのですが、そのほかがわからなかったので教えてください🙏

Grammar A police officer is looking for a thief who stole a jewel from a shop last night. Miku Suspects Harry shop clerk Ms. Smith shop clerk 2 Mr. Sato shop owner security guard *suspect *. witness Witnesses to the Crime I'm not sure whether the thief was a man or a woman. The person had light-colored hair. Last night, I saw a person wearing glasses coming out of the shop. A few minutes later, the alarm went off. I saw a person running out of the shop at around 9 o'clock. I was talking with the shop owner, Ms. Smith, at that time. *thief E crime, light-colored, alarm, go off Q1. Complete the police officer's report. Use the words below in the correct form. [ commit / have / see / know ]umbs Asolarpotenz •stole only the most expensive jewel in the shop. The thief....seemed I have " had the key to the shop. ⚫turned off the security cameras beforehand. appears (2 )( "Known ) the details of the shop. My boss and I are (3 )( ) the most suspicious person tomorrow. We are sure of '5(4 ) the crime. *commit ~犯罪など) を犯す, beforehand 事前に, suspicious 疑わし Q2. Get into pairs and ask each other the questions below. (1) According to the witnesses' hints, who seems to have stolen the jewel? Choose one the suspects. Mr. Smith Sato (2) Why is he/she the most suspicious? Because s seems to have stolen the jewel. Key Points for Expressing (➡p. ① 述語動詞よりも前の時を表したいとき 同じ時 to have done / having done を用いる。 to be → seem to have done 「~だった [した]ようだ」 予定・義務可能 意図 運命を表したいとき be to do 「~することになっている 〈予定〉」 「~しなければならない 〈義務〉」 「~することができる <可能> 「~するつもりである 〈意図〉」 「~する運命にある〈運命〉」

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