なぜOH=sa＋tbとしてるんですか？

p 基本 例題 25 垂心の位置ベクトル 平面上に△OAB があり、OA=5,OB=6, AB=7 とする。 また, △OABの垂 00000 心をHとする。 (1) COS ∠AOB を求めよ。 (2) OA= a, OB = とするとき, OH を a, 1 を用いて表せ。 指針 三角形の垂心とは, 三角形の各頂点から対辺またはその延長に下ろした垂線の交点であり, 解答 △OABの垂心Hに対して, OA⊥BH, OBIAH, ABIOH が成り立つ。 そこで, OA⊥BH といった図形の条件をベクトルの条件に 直して解く。 (2) では OH = sa+t とし, OA・BH=0, OB･AH=0 の2つの条件から,s,tの値を求める。 (1) 余弦定理から EDU COS ∠AOB= OA⊥BH より OA･BH=0 である から よって ゆえに 25s+6(t-1)=0 すなわち 25s+6t=6 ① また, OB ⊥AHよりOB･AH = 0 であるから {(s-1)a+t}=0 (s-1)ã·6+t|b²=0 したがって (2) (1) 5 à·b=|ā||5|cos <AOB=5.6.-= -=6 △OAB は直角三角形でないから,垂心Hは2点A,Bと 一致することはない。 F 21-9 Hは垂心であるから OA⊥BH, OB⊥AH OH = sa + to (s,t は実数)とする。 A+8A CHORUSS 0 52 +62-72 2･5･6 S= a•{sa+(t-1)}=0 tsasaH slal²+(t-1)ã·b=0C=100 よって ゆえに 6(s-1)+36t=0 すなわち s+6t=1 19 ① ② から 1)-(2*4 144 5 24' OH= 12 1 60 5 t= A 5 → 2ä+ 196 a+ 24 144 = p.400 基本事項 ⑤ 631 B ------ A stronas 重要 28 [参考] AB=18- =161²-26-a+la1² H |AB|=7, |a|=5, ||=6で あるから 72=62-2 ・a +5² よって 1=6 18-TA ①垂直→ (内積) = 0 BH = OH-OB O |a| =5, a-6=6 ①垂直→ (内積) = 0 ■AH=OH-OA A HA①-②から 24s=5 HA& 2a-6-6, 161=63 3x+u+= B 421 4 位置ベクトル、ベクトルと図形 X

なぜ写真の事について分かるのですか？

ので 0.8">0.0.0030 を断っ horgol ておきます。 Ⓒa>¹001>@ KW +log10 10-30.000 1.0 TOIxa00ε>"OIX Jet 1 =27 oggol 0²AAJ E.Dorgoli=¹8.00 gol (S) ←nの係数 310g 10 2-1 8 01 08 =log 10 10 < 0 だから (01 at 2018012 不等号の向きが変わります。 EE+8.5-= 4章 指数関数 対数関数 | 159 ●

至急よろしくお願いします😭😭できれば今日のお昼までに答えてくださる方を待っています＞＜ 英検2級の過去問です。(28)の答えが4なのですが、なぜそうなるのかわかりません、、どういった経緯で3人とわかるのか詳しく教えていただきたいです🙇🏻‍♀️ また、赤線部分のjoin ... Read More

From: Amy Gordon To: All Customer Service Staff <customerservicestaff@g-kelectronics.com> Date: January 23 Subject: Staff changes <a.gordon@g-kelectronics.com> Dear Customer Service Staff, I hope everyone enjoyed themselves at the company party last Friday. I had a really good time. I think that the Grand Hotel was the perfect place to have it. Don't forget that some of you won prizes in the bingo games that we played. Steve Miller in the sales department says that he has the prizes, so if you won something, go and see him to pick up your prize. I have some other announcements as well today. Six new people will be joining our company next month. They've all recently graduated from college, and two of them will be coming to work with us in the customer service department. We'll have three new co-workers altogether because Kent Gardiner will also be moving to our department at the same time. He has worked in the design department at G&K Electronics for 10 years, so I'm sure that many of you already know him. There are a couple of other staff changes, too. Peter Smith, the manager of the accounting department, will be retiring at the end of next month. Peter has worked at G&K Electronics for over 40 years. There will be a short retirement ceremony for him in Meeting Room A at 5 p.m. on February 28. Also, starting next week, Rachel Martin will take six months off because her baby will be born very soon. Sincerely, Amy Gordon Customer Service Department Manager

(3)について、線で引いたところがよく分かりません…よろしくお願いします。🙇🏻‍♀️

2 [1] 実数xについての2つの不等式 (x-a+2)(x-a) > 0, 169527 |3x+1|<5 itund CING HOME AS がある。ただし, a は実数の定数とする. (1) a=2のとき, ① を解け. EDORECROTSBL (2) ②を解け. 3① かつ②を満たす整数xの個数が1個となるようなαの値の範囲を求めよ。

分かる方教えて頂けると嬉しいです☺️ なるべく急ぎ目でお願いします。

8. 英なぞクイズ! 様々な疑問文とその答え方、 否定文を作ろう! ① ① = 通常疑問文 / ② 以下=下線部、口を問う疑問文/答え方/最後=否定文 (1) (Eri eats natto every morning.) 3 1(Does) Eri ( 20 3( ④ 何する? eat ) natto every morning? (XX) :) done )( ---Yes, (She) ( doen ). / No, ( she No, (She ( docent) 6. 1 ② ( 3( ④ ( (5) 6 --( X X )( X :-( )( )( )( X doesn't eat -Yes, ( X ) Kota ( ) Kota( X ④( 5 6Eri (2) (Kota plays soccer in the park every Sunday.) 6 4 3 2 ⑤ 何する? » Eri( )( ( X ) Eri ( X ) it ( Eri ( ) ) ( ) ( )( X)( )Kota ( )( )( ) ( ) Kota( "( )Kota ( )Kota( )( ) ( ). ) it )( X ). ) natto every morning. ) it( ) ( ) ( every morning? :) ( every morning? )( eats =( oat ) + ( does )? ) ( every morning? ). / No, ( No, ( X there ( ) plays =( ) ) in the park every Sunday ? )( )( :)( ) in the park? )( )( )( ). ). ). ). ⇒ 0 X ) every Sunday ? ). ). ) every Sunday. in the park every Sunday ? ) there every Sunday. ) X ) ) )? ) there every Sunday. )( » )( Devery Sunday? )( )( X ) Sunday. (3)00 O 2

問題数が多くてすみません。

(7) Hurry up, ( ) you'll miss the train. 1. and 2. so 3. if (8) The singer is very popular not only in Italy ( 2. and 1. so 3. or (9) The man I saw was neither tall ( 1. and 2. but (10) The mayor expects ( 1. so (11) The news ( 1. that 2. though ) short. 3. or 4. or ) in France. 4. but (13) A novel is not always good just ( 1. but 2. as long as ) the city's income will double in the next five years. 3. that 4. as (12) ( ) he says "no," he will never change his mind. 1. Though 2. Once 3. Whether 4. nor ) he stole the company's money is unbelievable. 2. what 3. when 4. which ( 4. For ) it has been written by a famous writer 3. because 4. so that

答え分かりますか(´；ω；｀)

(6) 次の各文の空所に入れるべき最も適切な語をa~h のなかからそれぞれ1つ選びなさい｡ 1 (1) Mary doesn't know ( ) he will come tomorrow or not. (2) You must put on your coat, ( ) you will catch a cold. (3) You may take ( (4) So far ( (5) They are not rich, ( a. and f. wherever (7) Hurry up, ( 1. and ) book you like. ) I know, Tom is an able man who can do the job well. ) do they want to be. b. as g. whether c. nor h. whichever ) you'll miss the train. 2. so (9) The man I saw was neither tall ( 1. and 2. but 3. if (8) The singer is very popular not only in Italy ( 1. so 2. and 3. or ) short. 3. or d. or 4. or ) in France. 4. but 4. nor e. so (武蔵大) (亜細亜大) (国士舘大) (芝浦工業大)

教えてください！！

29. You should not keep pets ( 1 if 2 unless 30. We will be able to accept your offer ( unchanged. decided 32. ( 1 ☐33. ( 2 proposed 4 suggested 3 provided 31. "Couldn't you make the price on this car one million and a half?" "Well, all right, ( ) that you pay in advance." in case 2 in circumstance 4 on the condition 3 for good □ 34. ( 1) you take good care of them. 3 otherwise 4 though 35. ( ) the passenger sitting next to you wasn't feeling well, what would Remember Suppose 4 Act 3 Think ) that you assure us that the agreed price will stay 111 ), he is so talented, he cannot finish all the work he has now. Despite 2 Because 3 Since 4Although ) she is short, she runs faster than any other student in my class. 22 Therefore 1 Even 4 If 3 Though 36. Igo jogging every morning, ( Coo even if 3 in spite of you ) it's raining. except for although 111 <中部大 > ) I started watching the tennis final, I could not do anything else until it ended. 111 Although 2 During 3 For 4 Once 〈近畿大 > < 学習院大 > do? 〈大阪産業大 〉 111 < 摂南大〉 112 < 神奈川大 > 37. Many Japanese have a Christian style wedding, ( ) they are not Christians. 1 as if 2 despite 3 even though unless 112 <杏林大 > 112 〈 岩手医科大 > 時 112 < 金城学院大 > 112

教えてください！！

29. You should not keep pets ( 1 if 2 unless 30. We will be able to accept your offer ( unchanged. decided □ 32. □ 33. ( 2 proposed 3 provided suggested 31. "Couldn't you make the price on this car one million and a half?" "Well, all right, ( ) that you pay in advance." in case 3 for good □ 34. ( ) you take good care of them. 3 otherwise 35. ( ) that you assure us that the agreed price will stay 111 < 学習院大 > 1 Even 2 in circumstance 4 on the condition 4 though ) the passenger sitting next to you wasn't feeling well, what would you do? Suppose 2 Remember 3 Think Act ), he is so talented, he cannot finish all the work he has now. Despite 2 Because 3 Since Although 36. Lgo jogging every morning, ( O even if 3 in spite of ) she is short, she runs faster than any other student in my class. Therefore 3 Though 4 If ) I started watching the tennis final, I could not do anything else until it ended. m <近畿大 > 4 Once 3 For 2 During Although ) it's raining. except for 111 <中部大 > 4 although 37. Many Japanese have a Christian style wedding, ( 1 as if 2 despite 3 even though 4 unless 〈大阪産業大 > 111 111 <摂南大〉 ) they are not Christians. 112 < 神奈川大 > 112 <杏林大〉 112 〈 岩手医科大 〉 112 < 金城学院大 > 112

どうして上はnecessary の前にisがないのに、下はpossible の前にisがあるのか教えてください。何が違うのでしょうか、、。

C 4 私は[すべての国々が食糧不足に対処すること] が必要だと思う。 (例文 ②1 ) I think it necessary for all countries to deal with food shortages. その経済学者は, [日本が近い将来、深刻なエネルギー問題に直面する こと] がありうると述べている。(例文2 ) that Japan will→ The economist says it is possible for Japanese to face S to sereous energy problem in the near future.