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数学 高校生

赤の線の式になるのか分かりません。また、黄色の線になるまでの途中式を教えてください🙏

(1)(3x+2y)°の展開式におけるx*y? および xy° の係数を求めよ。 7 sa-2)の展開式におけるaおよび 古の係数を求めよ。 (2) ( 定理の利用 (a+ b)"のnの値が大きい →ニ項定理を利用 (a+b)" =,Caa"+»Cia""'6+»C»a"-"6°+ … 定理の導き方はp まとめ参照。 +,C.a"-"b"+…+.Cn-1ab"-1 +,Ca6" 一般項 Action》(a+b)" の展開式の一般項は,nCra"-"b(0SrSn)とせよ (1)(3.x+2y)°の展開式の一般項 C, (3.x)-"(2y)" =C,3°-r2" x-ry" (r= 0, 1, 2, …, 6) 係数 x*y°, xy° となるようなrの値は? (1)(3.x +2y)° の展開式における一般項は C,(3.x)°-"(2y)" ==C,3°-r2"x°-"y 「y' の係数は。C,3*r (r= 0, 1, 2, …, 6C23*2° = 4860 6C,3'2 = 576 6) 2 とおいて x'y”の係数は,r= xy の係数は、r=5 とおいて 文字の部分がx*yとな のはy=x'yと くとr=2 のときであ 7 2 (3a-)の展開式における一般項は (別解)(4章「指数関差 対数関数」の学習後) a a7-r C, (3a)- : a"-r-2r = d ,2r aの係数については a'-3r = a より 7-3r =1 から r= (r= 0, 1, 2, …, 7) aの係数について、 a-r =a とおくと a7-r= qr+1 1 の係数については =2 C3°(-2)° = 20412 7-r= 2r+1 より 1 = a -3 よって,aの係数は として a'-3r = a° より a- の係数について、 2r .10-r 2r とおくと a 三 3/ 7-3r = -3 から r= - 10-r= 2r より 10 (以降同様) r= 3 これは,rが整数であることに反する。 よって,一の係数は0 日係数は「なし」と答 てはいけない。 思考のプロセス

解決済み 回答数: 1
数学 高校生

赤の線と黄色の線を引いているところの文字が逆に変わっているのですが、何故だか分かりますでしょうか? 教えてください🙏

A= BQ+R の形で書け。ただし,(2) は x についての整式とま 次の整式Aを整式Bで割り,商Qと余り Rを求めよ。また、 A= BQ+R の形で書け。ただし、2はxについての B= 2x°-2 (1) A= 2x°+ 4r°-x+3, (2) A= 4"-3ry + " B= 2x+y Action》 整式の割り算は,式を整理して筆算を行え 筆算による割り算の注意点 *割られる式(A),割る式(B)を降べきの順に整理する。 ·余り(R)は割る式(B)より次数が低い。 次数の欠けたところはあけておく。 既知の問題に帰着 数の割り算 25を7で割ると,商3,余り4 → 25 = 7×3+4 整式の割り算 AをBで割ると,商Q,余りR →A= BQ+R x+2 42-2= であることに 2x°-2) 2x°+ 4r x+3 2x -2.x 4x°+ x+3 4x -4 x+7 Q=x+2, 2.°+ 4.°-x+3= (2.r°-2)(r+2) +x+7 よって R=x+7 また KA= BQ+R (2) Aをxについて整理すると A= 4x°-3y°x+y° xについての影 からyを定動 -3xyのxの -3であるとま DAのでの種 あるから、筆 き,2次の項の ye -3y°x+ y° 2x+y) 4r 4.x°+2yx -2yx°-3y°x -2yx°- y°x -2y°x+y° -2y°x-y けておく。 2y Q= 2°ーージ また 4.°-3.rp"+y= (2.r+y)(2r-xy-y")+2y° よって yについての整れ て計算すると解は 練習9(2)参照 R= 2y° り 思考のプロセス

解決済み 回答数: 1
英語 中学生

こちらの答えを教えていただきたいです。 お願いします;;

教科書と似たテーマの文 イ次に 地球温暖化 (global warming) についての文章を読もう 2 次の英文を読み,あとの問いに答えなさい。 STEP Today we sometimes have big typhoons and water shortages in the world. Scientists say that these come from global warming. According to research, 1 the average temperature is 0.78℃ higher than it was 100 years ago. Because of this, many problems happen all over the world. For example, the, lands,of Some countries started sinking because the sea level is rising., People in other countries can't harvest(bese it hasn't rained for a long time. 5 上 する To solve these problems, many countrieshave taken action. In 2015, they had a meeting in Paris and decided to work together on climate change. Japan also joined the meeting, and decided to reduce the amount of CO, by 26% compared to 2013 by 2030. 9 (注)typhoon 台風 rain 雨が降る shortage 不足 average temperature 平均気温 harvest 収穫する Paris パリ reduce 減らす CO, 二酸化炭素 compared to と比べて (1) 本文中の下線部の例としてあげられていることを,日本 語で2つ書きなさい。 (2) 本文の内容に合うように, ( )に適する語を書きなさい。 Scientists say that the ( (5点×7) 2思判·表 10点×7 || 0 ab t1ot くつかの国の土地は歌み行めていると、 ) for big typhoons の側の人をは収稿できないをと A and water shortages is global warming. A B The average temperature 100 years ago ) higher than it is today. (3) 温暖化に対する日本の取り組みを次のようにまとめまし に適する日本語を書きなさい。 年にパリでの会議に参加し, 対応を表明した。具体的には, 2030年までに二ニ酸化炭素 B a た。 a (3) D 量を 2013年比で ことを決定した。 の

未解決 回答数: 1
英語 高校生

教えてほしいです!!お願いします!!

問題は【1】~【4】まである。答えは各問題の指示に従って別紙の解答用紙に書きなさい。 【1】次の英文を読んで設問に答えなさい。 Headaches are a big problem. Each year, millions of people suffer from severe headaches that affect their enjoyment of life, (1) not to mention their productivity at work. estimate, headaches cost individuals and businesses more than (2) $50 billion each year! (3) This is one of the reasons research into headaches has become a worldwide effort. Although he did not know much about how headaches work, Hippocrates was the first doctor to find a way to treat them. By 400 BC, Hippocrates had discovered that the *bark from willow trees was useful in treating pain. He made a white powder from the tree's bark and gave it to his patients. Hippocrates did not know it, but he was actually prescribing a natural chemical in willow bark called salicin. Whena person eats salicin, the chemical is changed inside his or her body into (4) salicylic acid. It turns out that salicylic acid is good for stopping pain, including headache pain, but it is bad for a person's stomach. In the 1800s, a chemist in Germany slightly changed easier for people to take. commonly known as aspirin. Aspirin was used throughout most of the 1900s to treat headaches, but doctors had little idea about what really caused headaches. When doctors can *diagnose the cause of a disease, they can find better ways to treat it. Therefore, as medical technology developed, doctors began to use it to learn more about the human brain and about headaches. In fact, according to one m to make it This new form of the chemical was called acetylsalicylic acid, now acid's Now doctors classify headaches ( A ) two general types: primary and secondary. A primary headache is a condition ( B) as only the headache itself. one caused by another physiological condition, such as an *infection or a *tumor. For primary headaches, doctors have determined three possible causes. headache is caused by stress. characteristically felt on both sides of the head as a dull, steady pain. Another kind of primary headache is the *migraine headache. Exactly what causes these headaches is not well understood, but many experts believe it could be abnormal brain activity causing changes in the brain's chemistry and blood flow. For many people, migraines are caused by certain (5) stimuli, such as poor sleep or particular foods or smells. A sufferer usually feels intense pain on one side of the head and becomes sensitive to light and noise. If the migraine is severe, the sufferer may *vomit repeatedly. The third kind of primary headache is known as the cluster headache. Cluster headaches typically occur around the same time each day for weeks or months at a time. The person ( C)from this kind of headache usually feels pain on one side of her or his head, and the pain is centered around one of the eyes. Doctors do not know much (6) at present about cluster headaches, but they seem to be more common among men and could be related to alcohol or other things that affect a person's blood flow. Using computers and more advanced medical equipment, doctors continue to learn more about what happens in the brain before and during headaches. Especially in the case of migraines, some doctors believe they have found the part of the brain that sets off the reaction for severe attacks. With these insights into brain processes, doctors hope new ways will be discovered to stop headaches before they begin. On the other hand, a secondary headache is One kind of primary Doctors usually call these tension headaches, and they are 注: bark 樹皮 diagnose ~を診断する、~を突き止める 感染症·伝染病 migraine (headache) 偏頭痛 infection tumor 腫場 vomit 食べたものを吐く (出典:READING FOR THE REAL WORLD 3rd edition, Compass Publishing より)

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