等比数列の問題です。なんでこのような場合分けをするのですか？

Focus 初項a,公比rの等比数列の初項から第n項までの和Sn a(1-r")_a(r"-1) Sn=- a-roarn-l (r=1) 1-r r-1 = 1-r Sn=na (r=1) 等比数列の和は, (公比1 (公比)=1で場合分け

このような文でカンマが多すぎてどこの文の一部なのかわからなかったり、どこにかかってるのかわからなかったりします、 99ならto pay ,in goldってto pay できって新しいことを話し始めるのかと思ったら修飾してたとか これって全部文脈はんだんなんですか？

by any CD (99) 107 bio ab 9di nood end : p.198 99 The paper currency appearing in the 19th century English novels consists of notes issued by individual banks and not by a central government authority. In the 19th century virtually any bank, large or small, could issue its own notes representing a promise to pay, in gold, the stated amount to the bearer upon demand. * :p.200 100 Unfortunately, for the past century some humanists have been at odds with technologists, viewing technology as a harmful force beyond their control all the more intolerable because of its human origins. This attitude is part of the humanist's traditional focus on the past and unwillingness to embrace either the art or technology of the present. mwors 978rl gw indi

質問です。 どうして または なのでしょうか?? m=2で、共通解は-1　が答えではないのでしょうか?? どうしてその後も計算が続くのでしょうか? 全然わかってないですが、、、 解説、宜しくお願いします。

解 4 2次方程式 *** SUCHE x2-2x-m=0 がただ1つの共通な実数解をもつとき,定数mの値と,そのときの共通 解を求めよ. 考え方 1 ただ1つの共通解が存在するというので,それをとおくと扱いやすい。(xのまま だと,共通解を扱っているかどうかがわからない.) JESSDA Check 例題 45 共通解 xについての2つの2次方程式 x2+(m-4)x-2=0, 練習 45 Focus 共通な実数解を αとして, 2つの2次方程式にx=α を 代入すると. CUSS x) [a²+(m-4)a-2=0 ......1 ²-2-m=0.......② このam についての連立方程式を解くと, ② より, (m−2)a+m−2=0 (m-2)(a+1)=0 m=2 または α=-1 よっこれより、 (i) f(x) となる. A.Bを決したがって,解は, x=1±√12-(-2)=1±√3 <補足>となり,共通な解がただ1つであることに反する. (ii) α=-1 のとき ①に代入して, (-1)+(m-4)・(-1)-2=0 236_m=3 DE TREA> 050 38stuas についての2次方程式 =2のとき もとの2つの2次方程式は, ともにx-2x-2=0SS x²-2x-3=0x S方程式になる。 JACOBS α, m についての連立 次 このとき,もとの2つの2次方程式は、 この考えは x2-x-2=0, x2-2x-3=0 となり,それぞれ, (x-2)(x+1)=0 より, x = 2,-1 (x-3)(x+1)=0 より, x=3. -1 となるから、ただ1つの共通解 -1 をもつ. よって, (i), (i)より, m=3,共通解は -1 0+ (1) 38 CHAISKO 共通解をとおいて、 2つの方程式へ代入し 連立方程式を解く 11-②より,2の SCAM 項が消える. 因数分解できる . AB=0 ⇔ 1=(+x A=0 または B=0 13 15503 30030066-0 返すとよい) 共通な解が2つになる. ②に代入してもよい. PSCH Jelastu 2 m=3のとき、2つの 2次方程式が 1 を解にもち, 他の解は異なることを 確認する. - $30 0=8- ・ 81 STE

文章を読み200字以内の日本語で要約して欲しいです

Ⅰ 以下の英語の文章を200字以内の日本語で要約しなさい。 ad a We often forget that an important part of "scientific" knowledge was built on the study of alchemy and other magical practices Alchemists were interested in changing certain metals into more valuable ones For example they tried to change lead into gold, However, they also wanted to produce medicines (that would allow people to live forever or cure any disease. The philosopher's stone is known to us today from the Harry Potter series of To novels and movies This magical stone was believed to have enormous powers and make you capable of doing and knowing pretty much everything. 可能にする *John Dee was an alchemist (who was particularly interested in the problem <of foretelling the future from the positions of the stars and other planets He was also an expert in ordinary mathematics and navigation, One of his most * ふつう fell important projects involyed, research (on a universal language (for 巻き込む communicating with angels!Dee was extremely successful He made a lot of money/had (extremely high status (in universities and government, and owned one of the best libraries in Europe/much of it dedicated to magic. 捧げる However towards the end of the sixteenth century/ideas about magic were changing. Many Christians in England were unhappy(that people were still キリスト教入 communicating with the spirit world which was one of the goals of sixteenth century magicians, As you know Japanese people welcome the spirits of ancestors into the house during the Bon festival European Christians were not happy (about that kind of thing, and they complained (about similar European festivals like Halloween) At the same time, many Christians were afraid that alchemists might be trying to steal God's power. As a result, there was a powerful movement to shut down magic once and for all. 禁止する ALE V n You may be familiar with the Japanese manga and anime series *Fullmetal 45% a Alchemist./The story takes place (in a fictional world in which alchemy continues to function as a normal part of scientific knowledge For example> the heroes (of the series are searching for the philosopher's stone,/and alchemists carry out important work(on behalf of the government/If our 利益 modern world had developed (in the same way as the world of Fullmetal Alchemist people like John Dee would probably have continued to do well. In fact, he lost his jobs and money and died in poverty. 1

軌跡を求める問題なのですが 例題の解答によれば 十分性の確認をしてないようなのですが 答え方としてはそれでもいいのでしょうか？

200 第3章 図形と方程式 Check (1) P(t+2, 2t²-3) (2) 放物線y=x²-2(t+1)x+t+1 がx軸と異なる2点で交わると tが実数値をとって変化するとき, 次の点Pはどのような図形を描くれ の頂点P 例題 108 媒介変数と軌跡 考え方 (1), (2)で用いられている変数t を 媒介変数 (パラメータ) という. の満たす方程式を導く. 点Pの座標を(x, y) とおいて, x, yをそれぞれで表し, t を消去することで Focus 解答 P(x,y) とおく. [x=t+2 (1) ….………. ① ly=2t2-3... ② ①より, t=x-2 これを②に代入して, y=2(x-2)2-3 よって, 求める軌跡は, 放物線y=2(x-2)2-3 (2)y=x²-2(t+1)x+t+1 ={x-(t+1)}2-(t+1)+t+1 = {x-(t+1)}²-t²-t より, 頂点Pの座標は, (t+1, -t²-t) x=t+1 ......1 したがって, ly=-t-t... ② 放物線 y=-x2+xの x<0, 1<xの部分 YA x=(tの式) y=(tの式) O ① ② より, y=-(x-1)2-(x-1)=-x2+x ここで, 放物線はx軸と異なる2点で交わるので、 3310 D 20 y=-t-t<0 t(t+1)>0 より, t <-1,0 <t ① から, x-1<-1,0<x-1 より, x<0, 1<x よって, 求める軌跡は, 練習 108 (1) P(2t-2, 3t²+1) ** (2) 円x2+y2-2tx+4t -3-- tを消去 YA 2 1 4 0 1 1-2 XC 1\x (x,y)=(t+2.20 ① ② からを る. Cab 平方完成する。 Check 例題 (1) tがすべての実 とるときも の実数値をとる。 放物線y=2x- でもよい。 (x,y)=(t+1,6 ①より、 t=x-1 これを②に代入 x軸と異なる2点 わるという条件から tの範囲に制限がつ (頂点のy座標 ) < 0 x,yの方程式 (x,yの範囲に注意 tが実数値をとって変化するとき、次の点Pはどのような図形を描くか. (2) 考え方 解答 7 S

3行目、with whomの部分は関係副詞ですよね？ どのように訳せばいいか、文構造のとり方を教えてください🙇‍♀️

次の英文を読んで、設問に答えよ。 第1講 e.g. The *therapeutic use of pets as companions)has gained increasing attention in recent years for a wide variety of patients people with AIDS or cancer, the elderly and the mentally ill (Unlike people, with whom our interactions may be quite complex and unpredictable, animals provide a constant source of comfort and focu X S X 5 for attention. Animals bring out our nurturing instinct. They also make us feel saf (1) and unconditionally accepted. We can just be ourselves around our pets. らしきおこさまた stress-induced symptoms)<I x Research has shown that pet ownership can reduce $$E surgen 343 a study, people undergoing *oral surgery spent a few minutes watching tropical fis O' in an aquarium. Their relaxation level was measured by their blood pressure, muscl わかった Xp 10 tension, and behavior. It was found that the subjects who watched the fish wer

なぜ下線のところで判別式を使うのでしょうか。

Check 例題246 放物線と接線の囲む面積(②2) 2つの放物線 C:y=x²-5x+7, C2:y=x2+3x-1 の両方に接する 直線をl とする. (1) 直線l の方程式を求めよ. 解答 item (2) 放物線 C,C2 と直線ℓとで囲まれた図形の面積を求めよ . (工学院大) 考え方 (1) C に接する直線を考え, それが C2 にも接することから求める. (2) グラフをかいて求める部分を確認する. (1) C1:y=x2-5x+7 に接する直線を考える. 接点のx座標をα とおくと,y'=2x-5 より の方程式は, y-(α²-5a+7)=(2a-5)(x-α) Focus y=(2a-5)x-a²+7 この接線が C2:y=x+3x-1 にも接する。 x2+3x-1=(2a-5) x-g'+7 (+ook)=v x2-2(α-4)x+α²-8=0...... ①0 ① の判別式をDとすると, 接するから, D=0_ (d 1/1={-(α-4)}'-(α²-8)=0 より,α=30 よって、 直線l の方程式は, y=x-2 (2) 2つの放物線 C1, C2 と直線lとで囲まれ た図形は右の図の色をつけた部分である。1f= C1, C2 の交点のx座標は, SiとSの x2-5x+7=x2+3x-1より)x=1 C と lの接点のx座標は, (1) より, 2 と lの接点のx座標は, x2+3x-1=x-2 より, x=-1d+ops)}- よって, 求める面積は, S_₁{(x²+3x −1)—(x−2)} dx 10-01TRY インドプロロー +=$_,(x+1)dx+f'(x-3)2dxLd ++S²{(x²–5x+7)−(x−2)} dx 13,22311 x=3 | C の接線とC2の接 接線線が一致するとき この直線は C と C の両方に接すること を利用してもよい。 接点の座標は (α, 2-54+7) 接点 yを消去して, のx座標を求める 2 次方程式を作る. 接する ⇔ 判別式 D=0 (重解をもつ) α=3 を接線の方程 式に代入する. wy IC2 IC1 放物線と接線 連立して (判別式) = 0 =1/12(x+11+1/23(x-3)=1/22-1/3(-2)=108 S__ |(²=2) 18+ (6 78-8 *** 1 O 23 16

(3)は答えは2枚目で自分の書いた解答は3枚目なんですけどこれでもやり方合ってますか？字汚くてすみません💦

演習 2･1 関数f(x)= 1+ logx 2 lim- X→∞ XC (x>0) について,次の問に答えよ.ただし,必要ならば 10gx0 を用いてもよい。 (1) f(x) の導関数f'(x) および,第2次導関数f(x) を求めよ. どちら (2) y=f(x) の増減, 極値, 凹凸を調べて, そのグラフの概形をかけ. (3) 1<a<bのとき,0<f(a)−f(b)<b-αが成り立つことを示せ。 .0<B+(1+gol )d -d gold A JARO..

この問題の答えを教えてください🙏

【ⅢI】 次の(A), (B)の設問に答えよ。 (A)14点,(B) 6点) (A) 次の英文を読んで下の設問に最も適切な解答をせよ。 特に指示のない選択式の設問は記 号を1つ選んで答え, "You may choose more than one option." と指示のある設問に対して複 数の記号を選ぶ場合は, アイウエオ順に解答すること｡ Mike: Hello Alex, long time no see! Alex: Hi, it's been almost two years since we last met each other! How were you doing? Mike: Until recently, I was frustrated that I could not meet my friends at university, but I was able to spend more time with my family, so I was okay. By the way, how did you like the online classes? Alex: Personally, I did not like them. It was difficult for me to maintain my concentration at home. Also, I could not resist the temptation of using my smartphone, because there was no supervisor at home who checked whether I was working hard or not. Mike: If you use your phone during class, the professor will definitely tell you off! Mo Alex: Another reason why I prefer in-person classes is that I can ask questions or have discussions with my friends. In the Pre-covid-19 era, when I had questions, I went up to my friend Thomas, one of the best students in our faculty and he taught me everything that I did not understand. Mike: That was a huge issue for me as well. If I have questions piled up, then I am more likely to dislike the subject and have more anxiety towards it. So, my friends and I decided to have meetings online on a regular basis and this helped me to worry less about online learning. Alex: That was really ( 1 ) of you, I should have done that! So, are you in favor of online learning? Mike: Yes, although I have less face-to-face interaction with friends, I like online learning more because I do not have to spend a lot of time commuting to school. I live far away from university and it takes two hours for me to get here by train. B(A) Alex: Really! I did not know that, what time do you wake up? Mike: I usually wake up at 5 am. Alex: That's so early! What do you do on the train? Mike: I just do netsurfing and I do not feel that I use my time productively on the train. If we can continue to take online classes wherever we want, we can get more flexibility in our schedules, We won't have take the time to commute to the university to attend classes, or if we like it, we may even be able to watch lecture videos on our phones while traveling by train. Alex: I understand your opinion, but didn't you have any technical problems? Mike: I only had a few. Besides, most of the professors posted recorded videos of lectures after class. So, I watched the recordings when I missed some parts. Furthermore, I could study at my own pace and the videos allowed me to digest what I had learned. Alex: That's a good point, but it had an adverse effect on my learning. Mike: How? Alex: I started skipping my online classes because I thought I could just watch those recorded videos later. So, just before exams, I had so many videos to watch. Mike: Maybe, traditional classroom settings might be better for people like you. Alex: I think so. Oh, it's time to go to class. Mike: Oh, yeah, have a good day. Alex: You too! 問1 NOTES Topic of the conversation: (2) Standpoint Basis Mike (3) (5) Choose the best one to complete blank 1. 7 because cruel clever I kind 2 Choose the best title to complete blank 2. 7 How to get good results at university Technical issues in online classes Safe remote learning at home I Online learning or learning face to face Alex (4) (6) -11-

この問題の答えを教えてください🙇‍♀️

【Ⅲ】 次の(A), (B)の設問に答えよ。 ((A)14点,(B)6点) (A) 次の英文を読んで,下の設問に最も適切な解答をせよ。 特に指示のない選択式の設問は記 号を1つ選んで答え, "You may choose more than one option." と指示のある設問に対して複 数の記号を選ぶ場合は、 アイウエオ順に解答すること。 Mike: Hello Alex, long time no see! Alex: Hi, it's been almost two years since we last met each other! How were you doing? Mike: Until recently, I was frustrated that I could not meet my friends at university, but I was able to spend more time with my family, so I was okay. By the way, how did you like the online classes? Alex: Personally, I did not like them. It was difficult for me to maintain my concentration at home. Also, I could not resist the temptation of using my smartphone, because there was no supervisor at home who checked whether I was working hard or not. Mike: If you use your phone during class, the professor will definitely tell you off! Hot Alex: Another reason why I prefer in-person classes is that I can ask questions or have discussions with my friends. In the Pre-covid-19 era, when I had questions, I went up to my friend Thomas, one of the best students in our faculty and he taught me everything that I did not understand. Mike: That was a huge issue for me as well. If I have questions piled up, then I am more likely to dislike the subject and have more anxiety towards it. So, my friends and I decided to have meetings online on a regular basis and this helped me to worry less about online learning. Alex: That was really (1) of you, I should have done that! So, are you in favor of online learning? Mike: Yes, although I have less face-to-face interaction with friends, I like online learning more. because I do not have to spend a lot of time commuting to school. I live far away from university and it takes two hours for me to get here by train. Alex: Really! I did not know that, what time do you wake up? Mike: I usually wake up at 5 am. ant mo Alex: That's so early! What do you do on the train? Mike: I just do netsurfing and I do not feel that I use my time productively on the train. If we can continue to take online classes wherever we want, we can get more flexibility in our schedules, We won't have to take the time to commute to the university to attend classes, or if we like it, we may even be able to watch lecture videos on our phones while traveling by train. Alex: I understand your opinion, but didn't you have any technical problems? Mike: I only had a few. Besides, most of the professors posted recorded videos of lectures after class. So, I watched the recordings when I missed some parts. Furthermore, I could study at my own pace and the videos allowed me to digest what I had learned. Alex: That's a good point, but it had an adverse effect on my learning. Mike: How? Alex: I started skipping my online classes because I thought I could just watch those recorded videos later. So, just before exams, I had so many videos to watch. Mike: Maybe, traditional classroom settings might be better for people like you. Alex: I think so. Oh, it's time to go to class. Mike: Oh, yeah, have a good day. Alex: You too! 問1 NOTES Topic of the conversation: ( 2 ) Standpoint Basis Mike (3) (5) Choose the best one to complete blank 1. 7 because cruel clever I kind 2 Choose the best title to complete blank 2. 7 How to get good results at university Technical issues in online classes Safe remote learning at home I Online learning or learning face to face Alex ( 4 ) (6) -11- 18