3番の問題は和の公式を使わなければ場合分けはしなくて良いのですか？

(2) 初項が2,公比が 3, 和が242である等比数列の項数を求めよ。 (1) 公比が3,初項から第6項までの和が728 の等比数列の初項を求めよ。 和をSとすると, S3 = 3, S6=27 であった。 このときa, rの値を求めよ。 [(3) 大阪工大] p.365 基本事項 3 基本11 (3) 初項a,公比rがともに実数の等比数列について,初項から第n項までの CHART & SOLUTION 等比数列の決定 まず初項 αと公比r (3) の値が与えられていないので, 和の公式を使うとき,r=1 と r≠1 に分けて考える (1),(2),(3) 和が与えられた問題では, 項数nについても考える。 必要がある。 開 (1) 初項をaとすると,条件から よって, α(1-729)=4･728 から r≠1のとき, S3=3 から a{1-(−3)} 1-(-3)。 (2) 項数をnとすると,条件から ゆえに 3-1=242 したがって, 項数は n=5 (3) r=1のとき S3=3a, S6=6a 3a=3,6a=27 を同時に満たすαは存在しないから不適。 3101534 PRACT LEDS a=-4 2(3-1) 3-1 a = すなわち a(r³--1) r-1 -=728 -=242 =3 .P¶ "(x + a(rº_1)__LA また, S6=27 から = 27 19 7-1-17 E r°−1=(r3)2−1=(n-1)(n+1) であるから、②より 3"=35 „§ (= a(r³−1).(√³+1)=27 r-1 これに ① を代入すると 3 (3+1)=27で解くと、 よって r3=8 rは実数であるから 3 r=2, ① から 7 ...... (1) 公比 - 3 項数 n=6の等比数列の和が 728 である。 Sn=a(²-1) r-1 ← 243 = 35 等比数列の和の公式を 使うときは,まず,公比 rが1であるかどうか を調べる｡ St. a(³-1) r-1 369 の 17a=3 -·(³+1)=27 に3を代入。

考えても分かりません。解答お願いします

20 Unit 1 - History - Gutenberg is famous for inventing printing, but he didn't really invent it. He invented a better way of printing. [2] For hundreds of years people used blocks of wood* to print. They used a knife to cut words backward in the block of wood. Then they covered the block with ink and pressed it onto paper. When they pulled the paper from the inky blocks, the words appeared on the 金属 5 paper in the right direction. In Korea and China, people printed with metal type* instead of 右向き wood. (2)Either way, printing was difficult and very slow. It took several years to make one copy of a book. [3] Books were very expensive and rare. Only ( 3a ) people could buy them, and ( 3b ) 10 people could not read. But, as ( 3c -) people learned to read, books became more popular. So people wanted to find a quicker, better and less expensive way to print books. One of these people was Johannes Gutenberg. opsugas.l Y tinU 9003 iinil 4 Gutenberg was born in Mainz, Germany, around 1400. He was good at working with metal, but probably had no idea how people printed in China. His idea was to make a piece Clarey operan 15 of metal type for each letter of the alphabet and use the letters (4)over and over. (5)He could put the type together to make words and arrange words to make pages. With ink on the type, he could press paper on them to print a page. A "printing press" machine could make hundreds of copies of a single page quickly. After that page, he could rearrange the same letters to make other words and print other pages. LISSH Si nou 5 It took Gutenberg a long time to make the type for each letter of the alphabet. When he finished the type, he didn't have enough money to make the printing press. He borrowed money from a man named Johann Fust. After many years, Gutenberg's printing press was Legione ready. Gutenberg printed his first book, the Bible, around 1455. 6 There are only twenty-one complete copies of the original Bible. They are some of the 25 most expensive books in the world. In 1987, part of a Gutenberg Bible sold for $5.3 million. 7 Today people remember Johannes Gutenberg. The city of Mainz has a statue of him and a museum. His original printing press is in the museum. (6)They print several pages a day to show that it is in good condition. earoviaU 012mu 394 words/#IN block of wood: type: vrigsypola 01 sind 7 an Oupside down & 下線部 (6) を日本 7. 本文の内容に合わ Many people & Gutenberg g Gutenberg Olt was a long Though Gu cost a lot of Hannes Rotest

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.

定期テストの課題作文練習です。添削お願いします。

I visited the Smart City Exhibition and really enjoyed the self-driving car booth. It was impressive that self-driving cars are useful for, elederly and disabled people. I hope that many people can use the self-driving car.

お願いしますm(_ _)m

USEFUL EXPRESSIONS 下の欄から適切な熟語を選び、次の日本語の意味を表わすような英文を作りなさい。 1.多くの自治体が、 廃棄物処理に費用がかさんでいることを心配している。 Many municipal governments ( cost of waste disposal. 2. 規則的な運動は、私たちの日常生活で大変重要な役割を果たすものだ。 Regular exercise ( ) our daily life. ) the rising 3. 科学者たちは、なぜそのクジラが浜辺に打ち上げられたのか、困惑している。 Scientists are puzzled ( ) why the whale had swum to the shore. 4. 大雨に加えて強風が、その地域の家々を完全に破壊してしまった。 The strong wind, ( completely destroyed the houses in that area. ) the heavy rain 5. 雨が降り続くうちに、川の水がうちの表玄関にまで来てしまった。 As the rain ( up to our front door. ) pour down, the river came as to be concerned about continue to in addition to play a role in

よくわかりません。。教えて下さい。

Work 例にならって、元素記号, 質量数、原子番号を記してみよう。 (例) 中性子の数が6の炭素原子: VEC E-LEAF ノ-836BT 6mm ruled ×36 lines 中性子の数が20の塩素原 子 ✓ 37 Cl 原子番号 だね｡ Cl

こちらの問題ご回答してもらいたいです。 回答が見当たらないため...

現在と過 STEP 1 基本問題 ① 現在形 1 ( 内の指示にしたがって書きかえましょう。 (1) I'm not busy on Saturdays. (I を We に変えて) (2) The students run very fast. (The students を The student に変えて) (3) We usually go to school by bus. (We を My brother に変えて) (4) You have some friends in London. (You を Lisa に変えて) 2 次の英文を日本語に訳しましょう。 (1) I respect the leader of our band. (2) She teaches mathematics at high school. 過去形 内の指示にしたがって書きかえましょう。 (1) His mother was at home. (His mother を His parents に変えて) 問合 (2) We play tennis every Sunday. (every Sunday を last Sunday に変えて) LAMA 3) I study English every day. (every day を yesterday に変えて) (4) We have a cute dog. (文末に ten years ago を加えて) 次の英文を日本語に訳しましょう｡ 1) A lot of foreigners came to Japan in those days. E93 I liked this song when I was a high school student.

the way〜はinが省略されてるから修飾するんですよね？名詞が名詞を修飾しませんよね？ここのoverはどういう品詞でどんな役割をしてますか？over以降が形容詞の塊になっているのに疑問を抱きました。not at allで何が省略されてるかわからないしどう訳せばいいかわか... 続きを読む

Reading newspapers has the advantage (over viewing V S O television news). You can read a newspaper <the way you S V O want to>. <With television news>, you take it <the way they S V O want to give it to you, or not at all.

though以降の訳し方がわからないです。どこが省略されているのかも初見で見てわからなかったし、なぜwidespreadとnot acknowledgedが対比されてるのか解説お願いしたいです

The idea [that humans are the center of the universe and S all other species exist only for the benefit of them>], though contradictory to practical experience>, is still V a widespread, <if often not acknowledged>, one. A C B

教えてくださいm(_ _)m

B) Conversations (ポイント)を学び、次の会話の日本文に合うように、( )内に適当な一語を入れなさい。 I. もう7時15分前だというのに、どうしたのかしら。 何時だか忘れてしまったのかし B:電話をしたら、 留守電だったから、もう家を出てしまっているに違いないわよ、 ). He ) to seven. I wonder what ( ) the time. A: It's almost a ( might have ( B: I called him, but Ⅰ got his answering machine. Ⅰ guess he must ) already. 2. A: カラオケパーティーはどうだった? B: 楽しんだみたいだ。 でもぼくの上司を呼ばなければよかったよ。なんせ帰らない んだよ。 午前3時迄いたんだよ。 A:( ) was your Karaoke party? B: People seemed to enjoy themselves. But we shouldn't have boss. He never wanted to ( my ) three in the morning! ) ! He staved