最後の「よって」からの計算の977という数字が、489を2倍して１引いたものだということは分かったのですが、何故2倍して1引くのかが分かりません！誰か解説してくださると嬉しいです。宜しくお願いいたします🙇

8 (66) 第1章 数 列 Think 例題 B1.30 群数列(2) **** 2の累乗を分母とする既約分数を次のように並べた数列について、 1 13 5 7 1 3 5 16' 1 3 2'4'4'8'8'8'8' 16' 16' (1) 分母が2" となっている項の和を求めよ. (2)初項から第1000項までの和を求めよ. 15 1 16'32' * ← p. 手 考え方 分数の数列は、分母と分子に着目する. この数列では同じ分母で1つにまとめる (分母) 2,4,4,8,8,8,8,16,1616, 16, 16, 16, 16, 16, 1個 2個 4個 8個 となっている.つまり, 分母が同じ数である項をひとつの群と考えると, 第2群に 分母が2" の分数が2個あることがわかる.さらに,分子に着目すると, ..... (分子)1|13|1,3,5,713,5,7,9,11, 13, 15………… となっている。 10 解答 (1) 分母が 2 である分数をまとめて第ん群とする数 列を考えると, 1 1 3 1 3 5 7 1 3 5 15 1 24'48'8'8'816'16'16' 16 32 となり、分母が2" の分数は2個あり,分子は初 わけられている 等差数列の和 1. 公差2の等差数列になっているから,その和 は, Sn= n(ate) 2 を利用 1+3+5+…+(221-12-2 (2) 各群の項数は, 1, 2, 48, 16, ･･････より 2" -=2n-2 分子 1+3+5+...... 2" S 第n群までの項数の和は、 1 (2"-1) 2-1 =2"-16 2°_1=511,2-1=1023より 第1000項は第 10群の第489項なので、求める和は第9群までの 和と第10群の第489項までの和となる. k=1 9 よって, 2-2 1 3 '+ + 210 20+......+. 977 SOI+ 1 (29- -1) 2 1 - + 2-1 210 2 2 -489-(1+977) 511 4892 500753 + 2 1024 1024 + (2・2"-1_ 2" (1+2.2-1-1) =22n-2 2 第1000項が第何群に っているかをまず調べる 9 1/2. 公園 22-2は初項 2の等比数列の初項が 第9項までの和 1+3+ ...... +977は, 初項 1,末項 977, 頭数 489 等差数列の Focus 分数の群数列は分母,分子に着目して見抜く 1/6 習 [30] * 数列 (1) 2-3 1-3 '2'3'3 1-2 2-2 +1136- 13 は第何頭か . 3-3 1 3'4 23 4 1 4'4'4'5 5/5 (2) 初項から第1000項までの和 ………について

合ってるか教えてください🙇‍♀️

分 ( 10 比較、疑問文、否定ほか ② 次の英文の( )に入る最も適当な語 (旬) を1つずつ選び、番号で答えなさい。 came from his 20 flights were canceled due to the heavy storm. □27 |271 ( 2 As many as 1 As long as ④As soon as STELO AN (大映中 3 As much as y to ten bluoda noy veidos of ( ■272 tignol\on\wodel) considering adding Last year we doubled the number of staff, and we are to sit down togeth 基本 more staff this year. 3 by 4 even 2 very □2 関西学 ☐ 1 plus My grandmother always tells me that the smaller the garden, () to look after 1 the easier it is 273 基本 ③3 it is the easier □274 worla lliw the easier is it notesbianco) Int ④ is it the easier <東海) many companies surveyed in the study sa He is ( ) far the tallest of us all.marketing tool. (大工金) 1 how 2 so too by gas (nedw\eritedt \ Isoiled be) There's not much news in today's paper, ( )? 1275 1 isn't it 3 is there 2 are there ed/whom abroad. 4 aren't there □276 When you finish reading the book, please tell me ( ) you think about it. 1 when 2 what 3 how careles which <女 □277 How come ( ) bring your wife? I did you 2 did you not 4 you didn't □278 3 didn't you ( ) go to the doctor if you are sick? Why not to 3 Should you to LO 2 Why don't you (4) If I were you, (-) A¹ & at A

調査で明らかになる（過去）以前（過去より過去）まで価値を認識していなかったということは、3枚目の図の感じということですよね？？

bne me how soitto to anesob dilw bebuerg a signing elles el AS 19. Dream Toys ------- the value of its Web site until a survey revealed that it was responsible for much of its business.build (A) does not recognize (B) were not recognized (C) had not recognized (D) will not recognize 19fts (A) eonia (8) nerw (3) 91erlw (a)

今からこの問題のテストがあります！ 答えを教えて頂きたいです！

I. mani"X" bnt Quiz 1al insmatste pniwallolantOpel llsw art no ftel mooooysterio Fill in the blanks with the appropriate words or phrases to match the following statement. 01. インターネットのない生活なんて想像もできない。 ) hardly imagine life without the Internet. ) 1 g to brossert) asyl as all anoutalbBQ rexland bed new pail nail art Innil bonteal V 30 ns ahenda sill lent benelque asinspo dT 80 nuzelmibe jut eg lon ed of ar leum and TO asamem Viimist lie yd have 02. コックピットは安全な場所どころではない。 The cockpit ( ) ( ) ( )( )( ) place. 03. 電話を切るやいなや、 また電話が鳴った。 No sooner ( ( oyoT yd ourpoind aew | 80 beaute all tudominib otomoomin bates Wo Hood art stelgmus al emot ansay wool 1.01 ) hung up than the phone rang again. 04. 愛というものは、言わば、心のための栄養である。LIGHmment na ro Love is, so ( ) ( ), a nutrient for the heart. bongenadyeing alt 05. 彼は毎晩誰かが事務所に残っていたらよいと提案した He ( ) that someone stay in the office every night. Vew art to to slam of soigston art live to draw all Co 06. 担保付きのローンから始めた方がよいと勧めたい。 I would ( ) that you start out with a secured loan. hom yde slevou a to poles conse of categ 07. 「ご用は承っておりますか」 「ありがとう。 ただ、 ぶらりとみているだけです」 "Are you (m) (i)?" "Thanks. I'm just browsing." nort 08. 先生が見えるまで、ロビーでお掛けになってお待ちになってください」 ) in the lobby while you wait for the doctor to arrive!" “Please be ( 09. パソコンがあれば、こんな手間はすべて省けますよ。 (パソコンを使えばこの手間はすべて省ける) Als) (c) you all this (c). A personal computer ( 10. 雨が激しく降っていたにもかかわらず、彼女は仕事に行った。 ) ( ) the heavy rain, she went to work. ( )( TO

答え教えてほしいです<(_ _*)>

(1) あそこを歩いている男性は有名な俳優だ。 of Hiblote Bllandmu ym berl [walk] 10 10 The man ( ) over there is a famous actor. (2) 私たちはモネによって描かれた絵が好きだ。 We like the pictures ( (3) あの割れたカップを見てください。 Look at that ( ) by Monet. [ paint] ever) 23. ) cup. [break] に適 2 日本語の意味に合うように,[ ]から適切な語を選びなさい。 + \992> (1) その映画の結末は驚くべきものだった。 The ending of the movie was surprising/ surprised ]. (2) その赤ん坊はそのおもちゃに退屈している。 Hounds prisario 8180 soiloq waa 10 The baby is [boring/ bored] with the toy. (3) このテレビ番組はあなたにとって興味深いだろう。 [1] This TV program will be [interesting/ interested ] to you. 上 を入れなさい。 代 emsn ym breed 10 B ripoad C

growsはなんでダメなんですか？

7p ・しいタイプ といる 訳じゃない 土 +27 In 1877, an unfamiliar type of weed appeared in Bon Homme County, Bon Homme 22.3 24 291 3x145 South Dakota, and began spreading across the northern Great Plains. The グレートプレーンズ plant, called tumbleweed, has green stems intricate branches, a nearly round (ア) shape, and long leaves with sharp points on the end. Mice, mountain sheep, とびった業 7212 47F2 Heal and pronghorn antelope* feed on it. The branches are soft and green when young but woody and gray when ( 1 ). ださい grous tumbleweed does not spend its entire life rooted KATERE Unlike other plants the がう点に Unlike other plants, the the soil. In the fall, a layer of cells in the stem weakens and the plant breaks off from its roots and rolls ( across the fields in the wind. The tumbleweed doesn't depend on wind, birds, or mammals to disperse its seeds. As this woody sphere rolls along, it drops its numerous seeds (up to 250,000 per plant). The seeds are unusual in that tored food reserve. Instead, each seed is a coiled, ブレット じぶんと

数1の正弦定理･余弦定理の応用の問題です。 どのように解くか教えていただきたいです、、。 <問題> 　△ABC において、sinA: sinB: sinC=13:8: 7のとき、Aの値を求めよ。 <答え> A＝120°

79 △ABCにおいて, sin A: sin B:sinC=13:8:7 のとき, A の値を求めよ。 (15点) (SOI) ** (S) ===

なぜAD＝BD＝CD＝ABなんでしょうか？？？教えてください！！平面図形の時はベクトルで大きさと向きを同じにするのに空間図形の時は違うんですか？？

94 正四面体の3つの頂点がA(0, 1, 2), B2, 3-2), (0, 3, 0) のとき, 第4の頂点Dの座標を求めよ。

3.4枚目が問題文、5枚目が答え、1.2枚目は問題を解くときに必要な文です。 なぜこの答えになるのかがわからないので教えてください。 解くのは大変だと思うので、一問だけでも大丈夫です。

2 次は, 高校1年生の Yusuke が書いた英文です。 これを読んで、 問1~間6に答えなさい。*印 のついている語句には、本文のあとに 〔注〕があります。(34点) My father loves *dinosaurs and *fossils. He (he/them/in/collects/is/that/interested /so) dinosaur toys, small fossils and books about dinosaurs. I heard he tried to find fossils along the river with my grandparents when he was young. When I was younger, my family took me to the science museum every year. My father loved looking at the dinosaur fossils there, and he always explained them to me. So, I got interested in dinosaurs and fossils, too. My father has a restaurant near our house, and he displays some dinosaur teeth fossils in the restaurant. One day, he introduced one of his customers to me. The man, Mr. Shirai, also loved dinosaurs and fossils, and often visited museums all around the world, such as in America, Canada and China. He realized that my father was interested in the same things because of the fossils in the restaurant. They became good friends. One day in September, Mr. Shirai came to my father's restaurant and showed me a fossil. It was a beautiful fish fossil in a brown stone plate. I was surprised to see it, Mr. Shirai A me a lot about the fossil. He traveled to Germany to look for fossils, and he found many fossils there such as fish, animal bones and leaves. The area is very famous for "archaeopteryx fossils. I once saw a picture of the archaeopteryx fossil in a book, so I wanted to go to see the fossil in -4-

4～8の問題を教えて欲しいです。 お願いします。

Reading 2 Bear's Pie こは、アメリカのある小さな ストラン。 営む夫妻には, がいるのですが……。 3 {, R: Richard White (=Mr. White) S: Susan White (=Mrs. White) Mr. and Mrs. White have been running a small but popular restaurant for Bobby Richard (=Mr. White) Bear's Pie 2 take over を引き継ぐ argue singer. You should s アーキュー/ fiercely by is Mr. and Mrs. White's only child. He wanted to be a singer, but White wanted him to take over the restaurant as a cook. Mr. White membered the day when they argued fiercely. I want to be a singer. I love music! (angrily) No, you can't be a take over this restaurant. I really understand how you feel, Dad. I love the restaurant, too, but I have my own dream! professional musician is impossible. I Being a /fanliフィナスリ/ angrily angali アングリリ/ hate to say this, but your dream will end up 10 just as a dream. Mr. White was very stubborn. However, Bobby couldn't give up his dream, and finally he left home. obileb of soil I hate to say thi こういうことは ないが a long time, and tonight is the last day of their restaurant. R: It's time to close, Susan. S: No, not yet, Richard! It's too early. 5 R: Why? It's almost ten. S: Wait! Bobby said he'd show up tonight. I know he will. R: I don't think so. It's been ten years since he Hoe left home. 5: Yes, but tonight is special for all of us. : We haven't heard anything from him. I guess he has forgotten us. I don't believe that! He can't have forgotten. long has it been since Bobby left home? Question What was Bobby's dream?