69. なぜこの解き方では答えが求まらないのでしょうか？？ （指針ではOH･AB=0,OH･AC=0だと書いていますがOH･BC=0も成り立つと考えこれを用いて求めようとしました。）

基本例題 69 平面に下ろした垂線 (1) 00000 空間において, 3点A(5, 0, 1),B(4,20, 0, 1,5) を頂点とする三角形 ABCがある。 原点O(0, 0, 0) から平面ABCに垂線を下ろし, 平面ABCとの 交点をHとするとき, Hの座標を求めよ。 MOKE LAANE 指針点 0 から平面ABCに下ろした垂線の足Hに対して, 点Hは平面ABC上にあり,かつ,直線OH は平面ABC に垂直である ととらえて考える。 ... HOX- 外直線OH は平面ABCに垂直であるから、直線 OH は平面ABC 上のすべての直線と垂直である。 ただよって、OHA, OHAC ゆえに OH・AB = 0, OH・AC=0 する単位べク |解答 AB=(-1,2,-1), AC = (-5, 1,4)×0+0×S+(I−)×(1 ①点Hは平面ABC 上にあるから, AH=sAB+tAC (s, tは実 CHONDRAL 114 60 数) (*) とおける。 ゆえに OH=OA+AH $1-01x6 =OA+sAB+tAC =(5,0,1)+s(-1, 2, -1)+t(-5, 1,4) ①00× =(5-s-5t, 2s+t, 1-s+4t)・ OH (平面ABC) であるから OH⊥AB から OH･AB=0 よって ゆえに OHACから 2s+t=2 -(5-s-5t)+2(2s+t)−(1¬s+4t)=0 OH･AC=0 よって ゆえに ② ③ を解いて よって, ① から ...... -5(5-s-5t)+1・(2s+t)+4(1-s+4t) = 0 s+14t=7 OHLAB, OHLAČ S= 7 9' 9 H(2, 2, 2) A t= - (801) A C x TEL ZA HA4 C OH B HO 重要 71 ****** CA SCORT! B (8)=(2004)+(A)+¹(SADA) A (*) OH =LOA+mOB+nOC, l+m+n=1として考えても よい｡ (0) 487 2章 9 位置ベクトル、ベクトルと図形

4,5,6の必要な量をもとめるのが分からないので教えてください。

問題次の(1)~(6) の中和反応の反応式を書き、 問いに答えよ。 H=1.0, C=12, N=14, 0=16, Na=23, K=39 (1) 1.5molの水酸化カリウム KOHを中和するには, 塩化水素 HCl は何mol必要か。 @ 116.5 1 mol KOH + HCl → KCl + H₂0 (2) 2.0molの水酸化カルシウムCa(OH)2を中和するには,塩化水素 HCI は何mol 必要 @ 140 ) mol か。 Ca (OH)₂ + 2HCl (CaCl₂ + 2H₂O → (3) 1.6 molの硫酸 H2SO4 を中和するには、水酸化カルシウムCa(OH)2は何mol必要か。 a 1(1)(- 6 ) mol F H₂SO4 + Ca(OH)₂ → Ca№O4 + 2H₂0 1 (4) 0.80 molの硫酸H2SO4 を中和するには、水酸化ナトリウムNaOHは何g必要か。 ral 5 1:2=0.8:2 H₂ NO 4 H₂SO4 + 2NaOH → Na2SO4 + 2H₂O 22 = 116 (mell (5) 30gの酢酸CH3COOH を中和するには、水酸化カリウム KOHは何g必要か。 ], [ 2. Imel CH3COOH + KOH CH3 COOK + ], ( ]g (6) 12.6gの硝酸HNO3 を中和するには、アンモニア NH3 は標準状態で何L必要か。 Amer X NHO NH3 NH4NO3 ), [ JL (1) HC1 +KOH KC1+ H₂0, 1.5 mol (2) (3) (4) (5) (6) HNO3 + NH3 ->>> + H₂O 2HC1+Ca(OH)₂ ->> CaCl₂ + 2H₂0, 4.0 mol H₂SO4 + Ca(OH)2 ->> CaSO4 + 2H₂O, 1.6 mol H₂SO4 + 2NaOH →→ Na₂SO4 + 2H₂O, 64 g CH3COOH + KOH CH3COOK + H₂O, 28 g ->>>> NH4NO3, 4.48 L 8.0

よろしくお願いします！

espicy bon ella. A 次の1~8の英文の空所に入れるのに最も適当なものを, (ア)~(エ)の中からそれぞれ 1つずつ選び,記号で答えよ。 1. Currently, soccer is ( least 265 million people (7) by 2. I ( college student. (7) have read (3) read ) far the world's most popular sport, beloved by at worldwide. (1) So ) The Wealth of Nations by Adam Smith several times when I was a Chapte 3. You will have to wait ( (7) out of (1) by () much 6. The extent ( about their personality. (7) which 4. Left-handers are much less common than right-handers, ( of the world's population. (7) making up ) October 1 before moving in. () in (1) had been reading will read (1) how (1) to which (1) made up () composing of (1) composed 5. Since mental health and physical health are closely intertwined, one will always affect (f the ). (7) another (1) to another (3) the other -6- (I) until ) only 10-15% () at whom ) you can trust someone depends on how much you know (I) to the other (I) in that 7. Rick speaks rather roughly, but at heart he isn't as wild as ( ). (7) it is (1) it looks (1) he sounds () he gets 8. Health experts agree that the most important change the majority of people need to ( ) to their diet is to reduce their fat intake. (7) find (1) stay () take (1) make

ここがなぜ②となるのか教えて欲しいです😥 至急解説よろしくお願いします🙇‍♀️

ZHAEX. I am nervous. I am not used to ( 1 speak C 2 speaking ) to a large audience. 13 4 have spoken 3 be spoken

九州大学英語2019年の英作文の添削をお願いします🙇‍♀️ 大問4が要約と英作文、5が和文英訳です！🙇‍♀️🙇‍♀️🙇‍♀️

〔4〕 九州大-理系前期 Read the following newspaper article and follow the instructions below. (36) 16 2019年度 英語 in Engligi taul" According to the Kanagawa Prefectural Police Station, a 20-year-old female university student caused a traffic death. The student was riding on a power- She moved off from an assisted bicycle when the accident happened. intersection and started riding on the sidewalk. At that moment, a 77-year-old lady was walking on the sidewalk and moved toward the bicyclist. The student hit the lady. The collision caused the lady to fall and strike her head. She was transported to hospital, but died of her injuries two days later. At the time of the incident, the student was apparently holding a smartphone in her left hand and a drink in her right while steering the power- assisted bike. Moreover, she had an earphone in her left ear. Therefore, police arrested the student for breaking the new law and riding recklessly. Police are investigating whether the student noticed that the old lady was walking toward her. They suspect that she was not paying sufficient attention because she was operating her smartphone right up until the collision. Her court appearance date has not been decided yet. The Mainichi, December 16, 2017 Instructions: Write two well-developed paragraphs in English. In the first paragraph, summarize the main points of the newspaper article above in lo approximately 100 words. Use different vocabulary and sentence structure from the original passage as much as possible. In the second paragraph, write your opinion about what should be done to reduce accidents like this in approximately 50 words. hosidinlong unich lor, condadnoah

この問題が分からないので教えて頂きたいです…

3 Can you complete this conversati Complete the conversation with the words and expressions in the box. Use capital letters where necessary. Practice with a partner. Then role-play the conversation using your own ideas. all right breaking up hold on a second PU I'll call you back I've got Greg Kenji Greg Greg Waters. Kenji Hello, Greg. Tokyo. I was just time are you arriving on Monday? Greg Well, I have my ticket here. Let's see, I arrive Kenji at, um, 3:30 p.m. OK, I'll Oh, Hold on a This is just let's see ✓this is wearing what do you call it what was I saying Kenji from the office in calling to ask... What come to the airport to meet you. Second-I've got another call. All right Hi. Sorry about that. So, I'll meet you. So, how will I recognize you? Well, I'm tall and Sorry, Greg, I can't hear you. You're droam ? Oh, yes, blond hair and - Greg Kenji Greg OK. Listen, Kenji Hi. That's better. So, ? Greg I was describing myself. So, um, I'll be the blond the sunglasses,. weaking wh guy a USA T-shirt. Kenji Um, OK. Maybe I should wear a - what you call it? A thing with my name on it so you can find me? a badge. Good idea! Greg Oh, where were we with you mean Kenji USA UNIT 1 UNIT 1 12

【molの意味】MO2とMは、6.02✖️10〜23個と一緒になるっていう考えがわかりません。そもそものmolの意味がわかりません。図で説明してくれると助かります。 【例えばこの問題じゃないですけどM2O2だとなぜか、molが2倍になって、元より増えるじゃないですか。こうい... 続きを読む

X₂ 7 元素の含有量と原子量 次の各問いに有効数字2桁で答えよ。 54 次の各物質について、()内の元素の質量パーセント [%] を求めよ。 (ア) 二酸化硫黄 SO2 ある金属Mの酸化物 MO2 17.4g を還元すると, Mの単体が11.0g得られた グルコース C6H1206 Cok 属Mの原子量を求めよ。 9/m (原子量) H=1.0 C=12/N=14016 Ne=20 S=32 Cl=35.5 Ca=40 Cu=64 ないから LUTADEO

高校文系数学 第2問∠OKAが鈍角であることから①が導かれる理由を教えて欲しいです

p1x-1)=x²-x x³ -(1+1)x+b=0 (x-¹) (x² + x-k) = 0 第2問 21²-41²424 €²-27 Oを原点とする ry平面上に点A(5, 0) がある. 長さが3の2つの線分 OP, AQ はそれ ぞれO, A のまわりを同時に同じ速さで反時計まわりに ry平面上で回転し始めた. 最初に, Q は B (8, 0) の位置にあった. 2+B 2線分が接触しないで回転し続けるための, Pの最初の位置を求めよ. L" b = 111 240 Ba 0 (1²-21 + 1)(2X+1) La=0 OA TAQ 2-1₂2 x²-x-150 x-1 Ex=x²x f OA 5 8Q OB = (02 (110) ((012). +3 06 = (3) + 3 / ( (ic 0 binb (5731100 K LNC (X4) -1 2 MIN (x-2)(x->^x-2)dx d

高校文系数学 第2問∠OKAが鈍角であることから①が導かれる理由を教えて欲しいです

p1x-1)=x²-x x³ -(1+1)x+b=0 (x-¹) (x² + x-k) = 0 第2問 21²-41²424 €²-27 Oを原点とする ry平面上に点A(5, 0) がある. 長さが3の2つの線分 OP, AQ はそれ ぞれO, A のまわりを同時に同じ速さで反時計まわりに ry平面上で回転し始めた. 最初に, Q は B (8, 0) の位置にあった. 2+B 2線分が接触しないで回転し続けるための, Pの最初の位置を求めよ. L" b = 111 240 Ba 0 (1²-21 + 1)(2X+1) La=0 OA TAQ 2-1₂2 x²-x-150 x-1 Ex=x²x f OA 5 8Q OB = (02 (110) ((012). +3 06 = (3) + 3 / ( (ic 0 binb (5731100 K LNC (X4) -1 2 MIN (x-2)(x->^x-2)dx d

答えはc です。 なぜそれになるのか分かんないため解説よろしくお願いします、、😥🙏

I had the taxi driver ( a. taken b. took ) her to the nearest hospital right away. c. take d. taking