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子固定法 x,y,x+y≦2を同時に満たすx,yに対し, z=2zy+ax+4y の最大値を求めよ.ただし,aは負の定数とする。 逆手流使ってもやこしくなる (東京経済大,改題) 1文字固定法 例題 12 や 13 のときと違い,本間では2変数x、yの間には等式の関係はない. こういう本格的な2変数関数を扱うときの原則は, イコールの式じゃない とりあえず, 2変数のうちの1変数を固定してしまう (定数とする) という考え方である. 仮に,yが整数だとして本間を考えると,0,1,2の値を取る.そこで, y=0, 1, 2のそれぞれの場合について, æの1変数関数であるぇの最大値をそれぞれ Mo, M1,M2 とす ると,求める最大値は, Mo, M1, M2 のうちの最大のもの であることは明らかであろう.例えば,日本を3ブロックに分けたときのそれぞれの優勝者を Mo, M1, M2 とすると,日本一の者はこの3人の中にいるはず、ということである Mo, M1, M2 はいわばブロック予選の勝者で, そういう勝者を集めておこなった決勝戦の勝者こそが, 真のチャンピオンであるということである. 「とりあえず1文字を固定する」 というのは数学の重要な考え方の1つなので,きちんと身につけて おこう. 解答 y≧0, x+y≦2により, x≦2である。 よってxの範囲は, 0≦x≦2.......... ① とりあえずに固定すると, z=2ty+at+4y. これをyの1次関数と見て, ・・☆ z=(2t+4)y+at (0≦y≦2-t) 2t+4>0により, これは増加関数であるから, x を tに固定したときのzの最 大値は,y=2-tのときの (2t+4) (2-t)+at=-2t2+at+8 ・② である.ここで, tを動かす. すなわち、②をtの関数と見なす. ①により,tの 定義域は 0≦t≦2であり,この範囲では, α<0により②は減少関数であるから, t=0で最大値 8をとる. 以上により, 求める最大値は8である. ???? æを定数にする. (x を定数とす る) ②はブロック予選の優勝者 (たと ←えば 「x=1ブロック」の優勝者 はα+6である) 22, at はともに減少関数 (グ ラフを考えれば明らか ). 322 注 上の解答の流れをもう一度説明しよう. x0,y,x+y≦2を満たす点(x, y) は右図 網目部上にある. P(x, y) がこの網目部を動くと きのzの最大値を求めればよい. YA 2 2-t y=2-x とりあえずを固定 (右図ではx=t に固定) す ると,点Pは右図の太線分上を動く. このときの の最大値が②である。 図の太線分を,0≦t≦2で動 かせば、網目部全体を描くので,②を 0≦t≦2 で動 かしたときの最大値が求める値である. まとめると, 1°xtに固定, yの関数と見る. 2°y を動かして最大値を tで表す. 3°°の式を関数と見て、その最大値を求める. 14 演習題 (解答は p.60) 平面内の領域-1≦x1, -1sy≦1において 1-ax-by-axy 0 2 x x=t yが太線分上を動くとき,☆によ り はyの増加関数であるから, CO の最小値が正となるような定数a, b を座標とする点 (a, b) の範囲を図示せよ. y=2-tのとき最大となり, その 最大値が ② である. ( 東大文系) 1文字固定法の威力が分 かるはず. 47

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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

要約文の穴埋めわかる方いらっしゃったら教えてください！💦😭

Lesson 5 Nobody's Perfect Summary: Scene 4 Fill in the following blanks. After the game, Galarraga went to see umpire Joyce, ①( who ) was sitting ( (onely) and feeling very sad. Joyce said he was sorry, and Galarraga kindly > gave him a hug. He told Joyce, “It's all right. Nobody's perfect." The nex day, Joyce worked ④( as Galarraga came to home plate to ⑤(exchange) lineup cards (instead) of th manager. When they ⑦( shook ) hands, Joyce cried. The fans saw this and starte ) the home plate umpire. Before the game started ⑩( (cheeng loudly. It was a ⑨( ), and good sportsmanship. ) moment that showed kindness,

至急！ 最初の文が自分の回答です。 なにかつづり間違いや文法など間違い、またはどういう表現のほうが、書き方、内容のほうが良いなどありますか？ 問題やその答え、解説は掲載してます。 自信が持てません。誰かお願いします！

wente No. Date Some university Students Joining Internship has knowing about companies student and choose To join internship! benefits, sach TS as and having relation other student they have disadvantages, such between 1 However as being unable To understand what do about the job and affecting Their studies because of internship. 88. To gne-

5 なぜこの日本語訳になるのでしょうか？

4. We ( ) ( 5. They were in a hurry. They ( 6. I ( ) ( ) go now, hadn't we? ) have had enough time to go shopping. ) finish the assignment by Friday. [ can't / had better / have to / may / must / shouldn't ]

英検準2級のEメールのライティングの問題です。作成した文が正しいかどうか見て欲しいです。

あなたは、外国人の知り合い (Alex) から, Eメールで質問を受け取りました。 この質問にわかりやすく答える返信メールをに英文で書きなさい。 がより理解を深めるために, 下線部の特徴を問う具体的な質問を2つしなさい。 あなたが書く返信メールの中で, Alex のEメール文中の下線部について、あなた ■あなたが書く返信メールの中で [ です。 ■に書く英文の語数の目安は40語~50話 ■ 解答は,解答用紙のB面にあるEメール解答欄に書きなさい。 なお、解答欄の外 に書かれたものは採点されません。 解答が Alex のEメールに対応していないと判断された場合は, 0点と採点される ことがあります。 Alex のEメールの内容をよく読んでから答えてください。 □の下の Best wishes, の後にあなたの名前を書く必要はありません。 Hi! I want to tell you something/ My dad and I went to/a new stadium/last Sunday. It opened two months ago. We watched/ a rugby game/between two university teams/there./ My dad taught me/some of the rules, too. It was my first time,/so it was very exciting. I will continue to watch rugby/ Do you think/more people will watch this sport? Your friend, Alex Hi, Alex! Thank you for your e-mail. 解答は,解答用紙のB面にあるEメール解答欄に書きなさい。 なお,解答欄の外に書かれたものは採点されません。

このbyはなんですか

精講 Terl to (In his youth), Albert Einstein spent a year (idling aimlessly). You don't get anywhere (by not "wasting" time) V something, unfortunately, [owhich the parents of teenagers tend frequently to forget to thoas edi & gribnoge 17 Bit Point

we should expect the demand for food to grow by but by how much more is considerably much more than the growth in population but by how d... 続きを読む

正誤問題です。本文と一致してたらa一致しないならbを選ぶ問題で、bだと思ったらaが正解でした。 わたしは本文中のthanは以上ではなく、○○より大きいと教わったので75-85dBより大きいつまり86dbから音圧レベルに長期間さらされると〜と思ってらbを選んだのですがなぜaに... 続きを読む

Noise-induced hearing loss can be caused by a single exposure to an intense impulse sound (such as gunfire), or by long-term exposure to sound pressure levels higher than 75-85 dB e.g., in industrial settings. The trends in prevalence of tinnitus in Europe are particularly worrving - a 2021 Article

このthoughってどういう役割をしているんですか？？ though、although ってその節で〜だが、という逆説を表す接続詞だと思っていたんですが文脈に合わなくて…

stories as books. She sent her first book to various publishers, but none of them were interested in publishing it. Unlike the publishers, Potter felt certain that the book would be a success, so in 1901, she paid one publisher to print copies of The Tale of Peter Rabbit. Because of costs, this first version was in black and white. The book was quickly sold out, so the publisher decided to publish a color version. This became a bestseller, and the publisher made a lot of money from that book and the other 22 books written later. Potter's sense of business, though was shown in the way she created and sold goods related to the books. After publishing the first book, she made a doll of Peter Rabbit and patented* it. This was the first time a character from a book had been patented. She then went on to develop dolls, games, dishes, and other products. Today, we are used to seeing toys and products connected with characters from books for sale. Peter Rabbit, though, was the first of these. The methods Potter developed to make a successful business out of her children's books are the ones that are often used by entertainment businesses today.