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数学 高校生

この問題の(2)で、z=0としたあとから分からなくなりました。 教えてください。 お願いします!!

364 第9章 標問 165 球のベクトル方程式 空間内に3点A(a,0,0), B(0, 24, 0),(0, 0, 2a) をとる。ただし、 a>0とする. (1) 2AP・BP=AP・BC をみたす点P全体は,球面であることを示し,その 中心の座標と半径をそれぞれαを用いて表せ. (2) (1)の球面をy軸に垂直な平面で切った切り口が、xy平面とただ1点を 共有する円となるとき, この円の中心の座標と半径をそれぞれαを用いて 表せ. (札幌医大) ○精講 AB を直径とする球の方程式は 中心A, 半径rの球の方程式は です. |AP|=r すなわち|n-al=r AP・BP = 0 すなわち (ba) (カー) = 0 解答 (1) 2AP・BP=AP・BCAP(2BP-BC) = 0 線分BCの中点 (0, a, a) を M とおくと, (*)は AP (BP-BM)=0 .. AP.MP=0 点Pの全体は, AM を直径とする球面であり,この球面の 解法のプロセス (1) APで式をくくる (2) 円と平面が接する ↓ 円と平面の共有点が1個 a a a 中心の座標は (01/10/01/2), 半径は1/21AM=1/24(a>0) 2' TOGRAP a a (2) (1)の映画 (11/2)+(1-1/2)+(2-122-213d²を軸に垂直な平面y=t で切った切り口である円の方程式は a 3 (x - 2)² + (2-2)² = ³a²-(1-2)² m² y=t ・(*) これがxy平面とただ1点で交わる円となる条件は, z=0 として得られる の方程式 (x - 2)² = 2²-(1-2)²³ t -a 2 ただ1つの実数解をもつことである. そのようなt の値は 2²-(1-2)² = 0 : 1 = 1±√2 t= a よって,求める円の中心の座標は ( 12, 1±√2 a 号/2. 半径は10/ 2 -a, 1

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英語 高校生

3枚目の問いの答えを教えてください。 よろしくお願い致します。

Radio Host: durlar aind Roger Ali: Radio Host: Roger Ali: Radio Host: Roger Ali: Radio Host: Roger Ali: Roger Ali: Radio Host: Roger Ali: Radio Host: Welcome back. As I mentioned before the break, Roger Ali is with us today to talk about artificial intelligence. Thank you for being here, Dr. Ali. Thank you for having me. I'll be honest with you. When I hear the words "artificial intelligence," the first thing I think of is the character HAL from the movie 2001: A Space Odyssey. ch tud goons bad Radio Host:ome In other words, the search engine draws conclusions about what we're looking for on the Internet. Roger Ali: Sure. Many people remember HAL. In the movie, he's the computer that controls the systems of a spacecraft. He also speaks with the people on the spacecraft. And he's not very happy when the people decide to turn off the computer. In the movie, HAL becomes very dangerous. That's right, but fortunately, artificial intelligence in the real world isn't like HAL. Well, that's good! Can you tell us what is happening in the field of AI? Many interesting things. For example, when we search for something on the Internet, the search results that we see are chosen carefully. The search engine has learned which websites are the most popular, the most reliable, and so on. This prevents us from seeing a lot of websites we're not really interested in. Tosa Right, so it only shows us the information it thinks we want to see, which includes go advertisements as well. We usually see only ads for products that the computer thinks we might want to buy. You said, "It thinks," but is the search engine really thinking? IST That depends on your definition of thinking. The search engine is capable of learning machine learning-and it does have knowledge. Knowledge about the Internet. Are learning and knowledge part of your definition of thinking? They're part of it, but human beings are capable of so much more. We have our senses hearing, smell, sight, touch, taste-and our emotions. We notice a lot about the world, and we use our judgment to make decisions. That's true, and most computer scientists know that we can't replace human beings with computers. We don't intend to make robots for every kind of job, either. That's just not practical.

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英語 高校生

しかく5とFOR COMMUNICATIONの所を教えて下さい。

5 各組の文を斜体の動詞に注意して日本文に直しなさい. (1) a. I got nervous in front of a large audience. b. I got a birthday present from Emi yesterday. (2) a. Please call me Harry. b. Please call me a taxi. 6 日本文の意味に合うように[ ]内の語句を並べかえなさい. (1) そこへは自転車で行ったのですか、 それとも歩いて行ったのですか. Did you [on, or, go, bý, bike, there ] foot ? there by bike on oh Did you (2) オーストラリアの首都はどこですか. go What [ Australia, capital, of, is, the ]? What is the capital of Australia (3) その警官は私に駅への道を教えてくれた. The [me, tø, showed, the station, police officer, the way ]. The showed me police the station the way to (4) いつの日か私の忠告が役に立つことがわかるでしょう. [ my, find, you, useful, adyſce, will ] some day. You will find my advice useful B: Kyoko did. a. did win foot? 5051 b. did you win c. won 5 (1) p.50 着眼点3 TS+V+Ch S+V+Oか」 some day. tired. (2) p.55 着眼点 4 TS+V+0+0% S+V+O+Cs 6 (1) 参 p.28 選択疑問文 (2) pp.31-33 疑問詞を使う疑問文 (3) 参 p.51 第4文型 各対話文の に入る最も適当な語句をa~dから選びなさい. (1) A: Didn't you do your homework last night? B:( ). I went to bed early because I was very a. Yes, I did b. Yes, I didn't c. No, I did (2) A: I'm going to the hamburger stand for lunch. Can I ( something? B: Yes, please bring me back two hamburgers. a. show b. hold c. get d. make (3) A: Who ( ) the first prize in the speech contest last week? (4) 参 p.55 第5文型 FOR COMMUNICATION d. No, I didn't ) you 文 he T d. was win

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