学年

質問の種類

数学 高校生

2次方程式の問題です。 どうしてx=αと置く必要があるんですか? どなたかお願いします🙇

共通解をxとおいて代入 2次方程式の共通解 重要 例題 95 △ 00000 x-2mx-m=0 がただ1つの共通解をもつときの値はであり、その を 0 でない実数とする。 2つのxの2次方程式x²-(m+1)x-m²=0と ときの共通解は である。 (福岡大) CHART 方程式の共通解 共通解をx=α とおく 共通解を x =α とおいて,それぞれの方程式に代入すると a-(m+1)a-m²=0 1. a²-2ma-m=0 基本 90 指針 2つの方程式の 共通解をx=αとおいて, それぞれの方程式に代入すると Q²-(m+1)a-m²=0...... ①. Q2-2ma-m=0 ...... ② これをmについての連立方程式とみて解く。 この問題では、①②での項を消去 なお、ただ1つの共通解」という条件に注意。 するとよい。 ...... I J-②から (m-1)a-m(m-1)=0 よって (m-1)(a-m)=0 ゆえに m=1 またはm=α [1] m=1のとき 2つの方程式はともに x2-2x-1=0 ここで、判別式をDとするとD/4=(-1)^-1・(−1)=2>0 であるからこの方程式は異なる2つの実数解をもち, 共通 解は2つになるから、 条件を満たさない。 [2] m=αのとき②に代入して m²-2m²m=0 よって m(m+1)=0 m0であるから m=-1 このとき、2つの方程式はそれぞれx-1=0, x2+2x+1=0(x+1)(x-1)=0. となり、 解はそれぞれ x=±1:x=-1 (x+1)' =0 ゆえに、ただ1つの共通解x=-1をもつ。 以上から m=7-1, 共通解は-1 No. Data ²の項を消去。 この考え 方は、 連立1次方程式を加 減法で解くことに似ている。 [2]でm=g=-1 は、実際に x-2x-1=0 を解くと、 解がx=1-√2.1+√2 であることから導いてもよ いが、左のように判別式を 利用する方が早い。 <①に代入してもよい。 147 2章 11 2次方程式

解決済み 回答数: 2
英語 高校生

この空欄に共通語を入れないといけないんですけど分からないのでよろしければ全部じゃなくても良いので手伝っていただきたいです💦

(3) (a) We must keep an ( ) on the political situation. (b) She hit him hard and gave him a black ( ). (4) (a) This is going to cost you a good ( ) of money. (b) In this African town, there are many merchants who ) in diamonds. (5) (a) That politician always takes a strong () on difficult social issues (b) He was so shocked by the news that he could hardly ( ) up. (6) (a) Why are you sitting so far ( ) from us? Come over here and join us. (b) The two brothers look so much alike that it is difficult to tell them ( ). (c) The dog has pulled the newspaper ( ) again! (d) I don't like to mix business with pleasure, but try to keep the two things firmly ( ). (8) (a) In my ( ) you should try the exam again. (b) The ( uldn't got (7) (a) () all his campaigning, he couldn't get enough votes to win. (b) It might be better for us to make allowance ( ) his inexperience because he is a newcomer. (9) (a) You will be sure to like him, ( ) you talk with him. (b) He writes a letter ( ) in a while, but not so often. The earth goes around the sun ( ) a year of 251) (10) (a) A( ) from the mountain top was spectacular. ) is a place where you can get water. (b) The doctor said that he would be ( (11) (a) Will you ( 15 (c) He has knowledge and experience as ( ). ) if he took this medicine. ) after the children while I'm out? in the long run 結局は (b) ( ) in the mirror before you drive off

解決済み 回答数: 1
英語 高校生

プラクティス全部教えてください🙇‍♂️

I could have Practice ce agai 1 日本語に合うように, ( 内の語句を並べかえて英文を完成させなさい。 1. 朝ご飯を食べたのに、もうおなかがすいた。 Ⅰ (though/hungry now,/am/had/I) breakfast. 2. 私が小学生のころ、 家で犬を飼っていた。 (a/Ⅰ/had/when/dog/my family) was in elementary school. 3. 「発表の準備はもうできましたか。」「いいえ、まだです。 "(your / yet / prepared for / you/have/presentation )?" "No, not yet." 2 日本語に合うように, ( に適切な語を入れなさい。 ns 1. 家に帰った時, 電車に傘を置き忘れてきたことに気が付いた。 When I got home, I discovered I Cub neqal, id) tie pholair) my umbrella on the Hovered train. 2. 第2次世界大戦が終わって何年たったのだろうか。 How many years 3 日本語に合うように, 下線部に適切な語句を補いなさい。 1. 私は6歳の時に野球を始めた。 I )( towar C 3. 昨夜ジョンが私に電話をかけてきた時、私はシャワーを浴びていた。 I(def) (a helip) a shower when John called me last night. doleriT 4. 私が駅に着いた時には, 列車はすでに出発していた。 The train ( )( FO communication skills. 3. 私は高校に入るまで, 5年間剣道をやっていた I ) World War II ended? entered high school. 4. この公園に来るのは久しぶりだ。 when I was six. 2. 私は最近, コミュニケーション能力の重要性を理解するようになってきた Recently ) when I arrived at the station. Part1 understand the importance of since I last came to this park. Lesson 4 kendo for five years when I 動詞の形を決める ①

回答募集中 回答数: 0
英語 高校生

この文の緑のマーカー引いてるところの、訳と構造を教えて欲しいです!特にcrimes for which のところがなぜそうなるかわからないです

and have 2 R not Advances in technology/over the past 200 years have been remarkable ght us many benefits/However, the integration of technology Into society has always been smooth/ The first industrial revolution began in Britain in the late 18th century/Machines developed at the time/could make clothes much more efficiently (1) 14 easily and cheaply than before. Even so not everyone felt happy about this at first. Groups of skilled weavers and textile machine operators known as Luddites feared 労働運動 that their jobs would be taken away/They began/a labor movem ement in order to protest and resist the widespread use of the new technology by factory owners. Their protest actions included destroying machines crimes for which some Luddites were killed by authorities. ようたい CO ↑ To Cut 27. 減速する we now know these technological advances did not/slow down. Over time, they became widely accepted and appreciated. Before long, other innovations like the steam engine were powering heavy machinery across Europe and beyond. The second industrial revolution, toward the end of the 1800s, brought the gasoline engine and the s use of electricity. The third industrial revolution, in the late 20th century, produced computers as well as digital technologies and communications. And, recently, experts have declared that developments in artificial intelligence (AI) and advanced robotics have led us into the fourth industrial revolution. Even today, however, we hear warnings about the potentially harmful effects of (2) contemporary technologies. Some observers claim that the latest AI inventions could have negative impacts on workers, businesses, and society as a whole. The main concern, as in past eras, is that machines will replace humans in the workplace. Thes- observers suggest that a large number of occupations might be lost to AI and robot in the next few years. Taxi and truck drivers, cleaners, and factory workers are amon those considered to be at risk. The fear is even expressed that the AI revolution might lead to mass unemploymen According to some experts, up to 800 million jobs could be lost globally by 203 Moreover, the workers who will lose their jobs to machines are likely to be those wit ewer skills and less education, increasing the gap between rich and poor. Some peop believe that this will create social conflict and instability. do not necessarily need to take such a negative outl

解決済み 回答数: 1