（2）の下線部はどういう変形なんですか、？教えてもらえると助かります！

2章 重要 例題 69 球面の方程式 (2) (1)次の方程式はどんな図形を表すか。 x2+y2+22+6x-3y+z+11=0 (2) 4点(0,0,0) (600) (04, 0, 0, 0, 8) を通る球面の中心の 座標と半径を求めよ。 CHART & SOLUTION 球面の方程式(x>0,A'+B'+C> 4D とする) p.122 基本事項 1 中心が (a, b, c) 半径がr(x-a)+(y-b)+(z-c)2=r2 2 一般形 x+y+22 + Ax + By +Cz+D=0 (1)(x-a2+(y-b)2+(z-c)2=r2の形に変形する。 (2)条件の4点の座標に0が多いから、2の一般形から求めるとよい。 そして, (1) のよう に変形する。 6 座標空間における図形, ベクトル方程式 (1) 与えられた式を変形すると (x+6x+3)+{y-3y+(1/2)}+{2+2+(1/2) (1)x,y,zの2次式をそ れぞれ平方完成する。 0= 3 =-11+32+| +32 +(1/2)+(1/2)2 ゆえに (x+3)+(2)+(z+/12)-(12/12) 平方完成の際に加えられ た定数項を右辺にも加え る。 したがって 中心(-3.1428-1/12) 半径 1/12 の球面 (2) 球面の方程式を x2+y2+22 +Ax+By+Cz+D = 0 と すると ②の方針。 ゆえに A=-6, B=-4,C=8 したがって, 球面の方程式は D = 0, 36+6A+D = 0, 16+4B+D = 0, 64-8C+D=04点のx座標, y 座標, Z座標をそれぞれ代入 する。 x2+y+z2-6x-4y+8z=0 これを変形して よって (x2-6x+32)+(y2-4y+22)+(z2+8z+42)=32+2+42 (x-3)2+(y-2)+(z+4)=(√29) ゆえに 中心の座標は (3, 2, -4), 半径は 29 inf. この問題の場合, 中 心の座標を (a, b, c) とし て,中心と4点の距離が等 しいことから求めてもよい。 PRACTICE 69 (1) 方程式 x2+y+z-x-4y+3z+4=0 はどんな図形を表すか。 (2)4点0(0,0,0), A(0, 2, 3),B(1, 0, 3), C(1,2,0) を通る球面の中心の座標 と半径を求めよ。 [(2) 類 九州大]

(3)最後の3語のto do soは、3語でまとまりですか？ 分かりにくくてすみません🙇‍♀️

Practice 3 香織は生徒会に所属している。香織はスミス先生 (Mr. Smith)に,生徒たちの前でキャシーにアメリカの学校生 活について話してもらいたいと思っているが、キャシーに頼んでもらえないかと依頼することにした。 あなたが香 織なら, 下線部の内容を,どのようにスミス先生に伝えるか。 伝える言葉を英語で書きなさい。

beをなくしたら合っていますか？2

Practice-2 キャシーは喫茶店の場所がわからなかったので、香織と駅で待ち合わせて一緒に行くことにした。香織はキャ シーに,今4時半だから4時40分に待ち合わせすることと、雨が降りそうだから傘を持って行くのを忘れないでね と伝えることにした。 あなたが香織なら, 下線部の内容を,どのようにキャシーに伝えるか。 伝える言葉を英語で書 きなさい。

答えourをmyにしても大丈夫ですか？③

次の里美(Satomi)とトム(Tom)の会話において,( )内に示されていることを伝える場合,どのように言え ばよいか。 (1)~(3)の Satomi : Good morning, Tom. の中に, 適切な英語を補いなさい。 Tom : Hi, Satomi. Satomi: I have a question. What's the date today? Tom : Satomi: Tom : Satomi : December 5th. So, today is your fifteenth birthday, right? Happy birthday, Tom. Thank you very much. This is a present for you. Here you are. Tom : Oh, I'm very happy. Can I open it ? Satomi Sure. Tom (1) (気に入ってくれるといいな。) : How nice! My favorite CD and many birthday cards. Satomi: They are from every student in our class. Tom : I didn't know you remembered my birthday. Satomi : You're our classmate. Tom : (2) (この夏, あなたがクラスに来て以来の親友じゃないの。) You often talk about your country, Canada. I think it's so exciting. I'm glad to hear that, Satomi. (3) (クラスのみんなに感謝しなくちゃね。)

1合っていますか？

【条件英作文】 Practice D キャシー(Cathy) はアメリカからの留学生で, 香織(Kaori) と同じクラスである。 香織は新しくオープンした喫茶店 のことを聞き, キャシーに, 今度の水曜か木曜に図書館近くのその店に行こうと思っているけど一緒に行かないかと誘 うことにした。 あなたが香織なら, 下線部の内容を,どのようにキャシーに伝えるか。 伝える言葉を英語で書きなさい。

(2)合っていますか？答えgood→bestにしました

Satomi : Good morning, Tom. 言え な英語を補いなさい。 Tom : Hi, Satomi. Satomi : Tom : I have a question. What's the date today? December 5th. Satomi : So, today is your fifteenth birthday, right? Happy birthday, Tom. Thank you very much. Tom : Satomi: This is a present for you. Here you are. Tom Oh, I'm very happy. Can I open it? Satomi Sure. (1) (気に入ってくれるといいな。) Tom : How nice! My favorite CD and many birthday cards. Satomi They are from every student in our class. I didn't know you remembered my birthday. Tom : Satomi : You're our classmate. (2) (この夏, あなたがクラスに来て以来の親友じゃないの。) You often talk about your country, Canada. I think it's so exciting. Tom I'm glad to hear that, Satomi. (3) (クラスのみんなに感謝しなくちゃね。) (注) present プレゼント card(s) カード Canada カナダ I hope that you will like it. We've been been best friends since you came to Our class this Summer.

(4)合っていますか？ 15行目くらいからだと思います

次の英文を読んで,(1)~(5)の問いに答えなさい。 Takashi visited Mr. Paul in London during spring vacation. famous places in London with Mr. Paul. He stayed at Mr. Paul's house. Takashi went to some One day, Takashi wanted to visit other places near London by himself and he told Mr. Paul about it. Mr. Paul said, "Go to Brighton. The city is very beautiful, so it's Takashi read the timetable many times and he (visit) by many people." station at s He looked at the clock in the planned to take a train at 8:40 in the morning. He arrived at the He sat on a chair and looked around him. Then he felt that something was wrong/ station building. It was 9:30. 8:30. But Takashi was very surprised, so he looked at his watch, but it was still 8:30. He found an old woman and asked, She looked at her watch and answered, "It's 8:30." He was relieved. suddenly, the old woman said to him again, "Oh, sorry. It's summer time now. 7.It started yesterday, so it's 9:30 10 "Excuse me, but what time is it now ?" now.' But just then her train came, so she stopped the conversation and ⑤( get) on the train. He went to Brighton. He enjoyed the city very much. Takashi didn't understand. took the next train at 9:40 and Takashi took a train back to London in the evening. He told Mr. Paul about his conversation with the old woman at the station. Mr. Paul laughed. Takashi asked, "What's summer time?" Mr. Paul said, "We have long daytime in summer. 15 From the end of March to the end of October, we put the clock forward an hour and then back again in fall. We do it to use the daytime more usefully. There are some good points, but also some problems." Takashi thought it was interesting. Mr. Paul said, "I want you to learn more about summer time." "I will," Takashi answered. After he came back to Japan, he went to the library and read a book about summer time.

(1、3)この英文で大丈夫ですか？

次の英文は,望 (Nozomi) が彼女の祖母について書いたものである。 この英文を読んで,(1)~(3)の問いに英語 で答えなさい。 I'm going to talk about my grandmother. She is sixty-three years old now. My grandmother likes swimming. She goes to a swimming school every Tuesday, Thursday and Saturday. She started to learn how to swim when she was sixty. One of her friends took her to the swimming school. There was a swimming class for old people who couldn't swim. Most of them were over sixty. She was surprised because old people were trying to do a new thing. She wanted to try something new so she decided to join the swimming class on that day. At first it s It took six months to swim. Now she can swim fifty meters. She said to me, "You can I hope I will enjoy swimming with her someday. was not easy for her to swim. start a new thing at any time." (注) most of~ 〜の大半 someday いつか over ~を超えて surprised 驚いた try to ~ ~しようと努める (trying は ing形) (1) How many times in a week does Nozomi's grandmother go swimming at the swimming school ? She goes swimming at the swimming school three times a week. (2) When did Nozomi's grandmother start to take a swimming class? She started to take a swimming class when was sixty. (3) Why did Nozomi's grandmother decide to join the swimming class? She wanted to try something new.

（お）で、問いがjohnになったつもりで4語以上の英語をかきなさい、模範解答が　can you take me なんですが 自分はwhy dont we go っと書きまして この場合減点ですか　ばつですか？　

図2 青木さんの家にホームステイしている bag) を使って料理を作るバッククッキング (Pack Cooking) の講習会 ながら会話をしています。 次の英文は、講習会のちらしと会話の一部です。 ①~③に答えなさい。 会のちらし Be a Pack Cooking Are you interested in an easy way of cooking? If so, how about trying "Pack Cooking"? It's very easy! Cut ingredients, put them into a plastic bag, put the bags in Day : Every Saturday Time : 1:00 p.m. 4:00 p.m. (Time to start eating: 2:30 p.m.) Place Fee : Room 105, Kozue Hall : 500 yen for one person To join us, you must come with an adult if you are an elementary school student. For more information, call at 123-4567. John (300 yen for food, 200 yen for the room) Students do not have to pay for the room. : Today's dinner tastes so good! How did Ms. Aoki Oh, thank you. Look at this. It is John (63) you make this? call "Pack Cooking." We need only water. ingredients, seasoning, and plastic bags. We don't need many cooking tools. That sounds interesting! I have never heard that. Ms. Aoki When we cook in this way, we can make several dishes in one pot at the same John time by putting the bags in the hot water and boiling them together. That means we can (う) water, right? Ms. Aoki : John That's right. We also need only a little seasoning before we seal the bags. (え) Why? Is that enough? I'm afraid that the taste will be Ms. Aoki: No! The food tastes good. The flavor of the seasoning soon spreads through the food because the bags in the hot water are sealed. After enjoying the dish, we have to wash only the pot and a few other things. Easy, right? John Ms. Aoki John : That's cool. I'm interested in Pack Cooking. (お) to this seminar? Sure. Then, let's go there next Saturday. You will pay only for food because yo are a junior high school student. : That's perfect! Thank you, Ms. Aoki. (E) ingredient adult stel seasoning - boil ~をゆでる fee tool. A pay for 〜 〜の支払いをする pot なべ seal 〜を密封する flavor 講習会のちらしとして (あ) に入れるのに最も適当なのは、ア~エのうちではどれです 一つ答えなさい。 ( ( 7 Cartoonist 1 Newscaster ウ Chef I Lawyer

⑵って エックスの増加量すなわち分母がa+3h−aで分母がhにならないからkを使い正しいものに直せるかという狙いという解釈であっでますか？ 合っててもわかりやすく解説が欲しいです。腑に落ちません

280 補充 例題 179 関数の極限値と微分係数 (1) 次の極限値を求めよ。 x²+x-6 x+8 [湘南工科大] (イ) lim x-x-12 x+2 X (ア) lim f(a+3h)-f(a) (2) 極限値 lim 0-4 h x113 f' (a) で表せ。 X (関西大) p.266 基本事項 2 CHART & SOLUTION 関数の極限値 limf (x) x-a 基本はxにαを代入 となるときは約分 lim k0 f(a+k)-f(a)=f(a)も利用できる k (1) (ア) そのままxに-2を代入すると, 分母・ 分子ともに0になる。 よって、分母・分子 ともx+2 を因数にもつ(因数定理)ので,x+2で約分してから代入する。(イ)も同様。 (2)→0のとき 3h0 だからといって (与式)=f(a)は誤り!)(S+= 3h=k とおいて, 微分係数の定義を利用する。 円生 合 (1)(ア) lim x3+8 (x+2)(x²-2x+4) : lim -2x+2 x--2 x+2 A EXERC 138 関数 しい 1390 (1) (2) B 140° 141 ← x → -2とは,xが 2以外の値をとりなが 1420 = lim (x²-2x+4)=(-2)^-2・(-2)+4=12+{ら2に近づくこと。 x112 (イ) lim (x+3)(x-2) lim x-2 -= lim x-3x-4 x²+x-6 x-3x2-x-12 x=-3(x+3)(x-4) --3-2-5/15 (2)3h=k とおくと, h0 のときん→0であるから f(a+3h)-f(a) f(a+k)-f(a) limf(a+3h)- h→0 -=lim k-0 lim3./(a+h)-f(a)=3lim 3 よって, xキー2 である から、分母分子を x+2 で割って約分してよい。 STE= 慣れてきたらおき換え をせずに 与式) =lim3 h0 f(a+3h)-f(a) =3f'(a) f(a+k)-f(a) k-0 k k-0 k としてよい。 =3f'(a) PRACTICE 179 13 (1) 次の極限値を求めよ。 143 3h HINT (7) lim x-3 3-27 (2) f(x)=x3 のとき, lim x3-1 (イ) -4x- め 東北学院大]