階差数列の和と一般項の問題です。１段目の左辺から右辺ヘの式の作り方を教えてください。💦

anを出す 問題 階差 初項から第n項までの和Snが, Sn=n²+4nで表される数列{an} の一般項を求めよ。 lami-an • n≥2 a = S-Sn = (n²+4)-| (n-1)² + 4 (n-1) | ON = n²+ 4n - [n²-2n+1+4n-4} (n²+ 2n+3) 一般項 x²+4nn²-2n+3 =2n+3 +4n = 1+4 = 5

59の1番は暗記ですか？

(ア)の解答群 原子半径 原子量 (3) 原子番号 (4) 電気陰性度 59 (イ)~ (オ)の ① 直線 平面正三角 ③平面正四角 ④ 正四面体 解答群 ⑤ 三角錐 折れ線 (20 東京理科大 改) 思考 化学 論述 グラフ 59. 分子間力■次の文中の空欄に適切な語句 100 (ア) (1) を入れ,下の問いに答えよ。 A 10 (a) 0412 50 分子からできている物質では, 状態変化を HFH2Te (d- おこす温度は分子間力に大きく依存している。 分子間力のうち, すべての分子に働く弱い引 力を ( A ) とよぶ。 14~17族の水素化合物 の分子量 (分子の質量の相対値) と沸点の関係 BA を図に示す。 14族の水素化合物のように, 構 造のよく似ている分子では, (A)と沸点の間様 に一定の傾向がある。 0 AsH3 沸点 NH3 SbH3 H2Se H2S HI -50 (°C) SnH4 -100 (イ) GeH4 (エ) SiH4 HCI - 150- (ウ) ┳━┳ T 2 20 20 40 60 80 100 120 ) 分子量(分子の質量の相対値)ra (1) 図中の (ア)~(エ)の化合物は何か。 それぞれ化学式で記せ。) (2) 下線部について, 一定の傾向とはどのようなものか。 30字程度で記せ。 (3) SiH4 HCI の分子量はほぼ同じであるが, 沸点はHCI の方が高い。 その理由を, 極性分子, 無極性分子などの用語を用いて簡潔に記せ。 (d) (4) HF, NH3 の沸点が同族の水素化合物に比べて異常に高い理由を20字程度で記せ。 思考 (広島工業大 改) 60. 結晶と化学結合 ■次の(ア)~(カ)の結晶について,下の各問いに答えよ。 (ア) 二酸化炭素 (イ) 塩化アンモニウム (ウ) ヨウ化カリウム sa 素

高校の教科書の問題です。今度テストに出るところなので答えを教えて欲しいです！

Vocabulary 10 Compound nouns 1 Write a word to make three compound nouns. mail 1 business fire man 2 Write a compound noun from Exercise 1. ESSO 2 pop 3 rock 4 ache lights 2 1 gas station phones movie break 3 beans shop return 5 parking single 6 cut 5 6 brush salon for a headache gas 7 train 8 bus cook 9 text note 10 set glasses screen light cop jam 70 Unit 10 Our interactive world 7 8 3 Answer the questions using a compound noun. 1 When do people take aspirin? 2 If you want a recipe, where do you look? 3 Who delivers the mail to your house? 4 If you park in the wrong place, what might you get? 5 What should you put on your skin before you sunbathe? 6 What can you watch at the end of the day? 7 What must you switch on when you are driving at night? 8. Where can you get gas?

(2)で解説とやり方が違うんですけど、答えが合わなくて、どこが間違っていますか？

- - 12 - WA 302- (a-4) 0:4 ot A 2 こ "\ 1+3F+1 n +323.35- 3(3-1) 1+3 + 3. 3-1 3.3 (31) +(3-1) 2 2/2 (123n+2_9) 1/12(3h+28) n 3K Meu

来週テストなのですが、答えがないので教えてほしいです

5. iis car ra was ( ) by my brother. no tasup o in [call ] [break] auolo otpo 7 文法 下線部を主語にして、ほぼ同じ意味を表す文を作ってみよう。 1. My brother wrote this letter. This letter ( ) ( 2. Mr. Kato opens the door at 7:00. The door ( ) ( 3. All the children love Motala. ) ( ) by my brother. )at 7:00 by Mr. Kato. )by all the children. と。 ました。 Motala ( た。 した。 A beautiful sea ( た。 4. We don't see a beautiful sea from here. )( 5. Do they speak English in that island? ( )English ( ) from here. ) in that island? 意味に合うように、英文を完成させよう。

三角関数合成の問題です 有名角でない場合の‪α‬の部分の求め方がわかりません💧‬

Bsn 9 + 3 cos 0 (3)3章 23 3² + √3² = 1² +² = 9-+3 =12 √= 2√3. x 2√3 sin (O+α).

y＝x^2−3x+1のx軸の共通点のx座標を教えてください

15 [ ! peseid elem eros pue esn eseelde 0 2725767 5 長さ8cmの線分AB上の点Cをとり, AC, CB を1辺とする2つの正方形を作ります。 ACの長さ して、この2つの正方形の面積の和ycm² の最小値を求めなさい。 【主】 (式5点,答え1点) # 3.2" (8- 7) 2 式 =2x²-16g+64 20 n) 2(2–82) +64 + 2{(2-4)² - 42}+64 =2(2-4)2-32+64=2(2-4)+32 x=4のとき、32 答え 最少値 32cm² 6 次の2次関数のグラフとx軸の共通点のx座標を求めなさい。 【思判・表】 (各4点) (1) y=x2-x-6 (2) y=x2-3x+1 (3) y=x2+6x+9 (4) y=x2-2x+3 式y=x2-x-6 (272) (x-3)=0 式 y=x2-3x + 1 x=2.3 (1) (2) x=-2,3 答え 6 x²-3a+l (2) 答え 式 y=x2+6x + 9 (2+3)2:0 a = (3) (4) 式 y=x²-2x + 3 2±18 -(2)±√√(-2) 2x1 2 答え n=-3 答え 2:V8 2

この問題の答えが合ってるか教えて欲しいです！ すごく初歩的な質問ですみません！

° • つ内にamisareから選んで補いなさい。 1. Hi, I (am) ken. Nice to meet you. 2. You (are) a member of our club. 3. My sister (is) a doctor. She is very kind. + I have two brothers. They (are) college students. 次の各文を否定文と疑問文に書きかえなさい。 1. The park is open today. 2 * The park isn't open today. *Is the park open today 2 The shops are closed today. 7 The shops aren't closed today. Are the shops closed today )内に、下記の語群から選んで補いなさい。 1. I (like) pops, but my parents (like) classical music. 2. Mr. Young is a high school teacher. He (teaches) English. 3. My sister (works) as a nurse in Yokohama. [like (s) (teach (es) / work (s)] 次の各文を否定文と疑問文に書きかえなさい。 1. You know the answer. 15 You don't know the answer. * Do you know the answer? 2. Mr. Young works on Saturdays. Mr. Young doesn't work on Saturdays. Does Mr. Young work on Saturdays?"

英文法･語法問題600です 5問教えてください

( 神奈川大) ④knowing id 13. My best friend and I ( ) each other since we were five. ①have known 2 know 3 knew 14. My friend from Africa () snow until he came to Japan. (日本大) ①has not seen 3 had never seen was never seeing to Joq will have s e seen mi ai odieX SC guiclem ai 15. When Mary was introduced to Mrs. Smith, she realized she ( 2 was meeting Dis meeting ③3 will meet ) her before. olidyed met? 4 had met (東海大 ①have lived 16. At the end of next month, we ( ) here for three years. 3 will have lived 2 live (立命館ナ will live becast at D 17. I really must go and see the dentist. ijem gnols ( Dached One of my teeth ( ) for weeks. 2aches (共立女子 3 has been aching is aching 法

至急です。試験範囲なので教えてください🙏🙏

第1章 □ 13. My best friend and I ( ) each other since we were five. (神奈川大) ④knowing ①have known 2 know 3 knew 24. If it ( ) on Thursday, we will not go to the beach. (西南学院大) ids ①rains would rain ③rained has been rained 14. My friend from Africa ( ) snow until he came to Japan. (日本大) ago. ①has not seen 3 had never seen Joq was never seeing will have seen al ofie S 25. I don't know if our teacher ( ①camera ②come ien ( ) back next week.d( 3comes (東北薬科大) 4 will come gablem at 時制 15. When Mary was introduced to Mrs. Smith, she realized she ( ) her before. elids ③will meet was meeting 3 Dis meeting □ 16. At the end of next month, we ( ) here for three years. had met (東海大) ①leave 3. (this stone adoleft 30 (立命館大) 27. I wonder when he ( ①come ) next. ①have lived live ③will have lived will live betes 26. Turn off the lights when you (br) the room. ( ③will leave cause it ) yded ed Oleaving D (日本大) smod v②coming (nedloqa had come \I\e will come (日本大) ☐ 4.1 was nger in the shopping mall. Dspoken by 17. I really must go and see the dentist. One of my teeth ( ) for weeks. @being spoken Dached 2aches 3 has been aching is aching 18. I ( ) my homework for an hour when my mother came home. (大阪経済法科大) gile@ Dam doing 2 was doing 3 have been doing had been doing (共立女子大) D gaiblod od lliw bled ad lliw blod Hiw 9 ) noitools Intone A 20 Baiblod ai① 5. The room should ( Obe kept ) clean at all times @batept) bear of seeded over Y are gnitisqet need asdⓇ gairinger ai 6. When I came other hat the 東北福祉大) s building Obeing built .89mit in1976e 19. She ( ) in the accounting department for 10 years by the end of next month. ①has worked gatiog me 7. Michael ( ③3 will have been working has been working is working (国士舘大) gnibrawe need asd go ) 1015xib adf to bebrown ead bbw gingle Player three wensed and @has selected has been selecting trode) 1.8 810 Writing 20. When I woke up this morning, I decided I ( ) to get in shape. 杏林大) )vedT 8. C ①want ②wanted 3 will want 4 had wanted sqft 18beads ( 最頻出の項目を、もう一度書いて覚えよう。 ) awon ai dtime.eM nd that ☐ 1. I got your letter last week. I'm sorry (didn't / haven't/back/I/ written). boiling 21. Yesterday in science class, I learned that water ( ) at 100°C. ①was boiling 3 boils (大谷大) (1語不要) (武蔵大) 4 boil ☐ 2. (began / begun / the class / already / had) when I arrived. (1) 22. I will ask him about it as soon as he () back. ⑪come 2 comes bib@ ③will come (国士舘大) wen & Jdgood o 4 would have come (国士舘大) bassaid □ 3. もし天気 (the weather) が良ければ, 私たちは明日泳ぎに行く。 (1語不要) (防衛医科大) 23. I'll be back before it ( Drain ). ②rains wad nodw exey evil Tol nobno ni ( 3 will rain 4would rain ed (立命館大) We (the swimming / weather / will/be/is/tomorrow/go/if) fine. 6