数B 位置ベクトルです。 (2)の解説の5行目でsとtはどこのことを指すのですか？

基本 例題25 垂心の位置ベクトル 平面上に AOABがあり,OA=5, OB=6, AB=7 とする。また, △OAB の垂 421 OOOO0 小題24 心をHとする。 ) cos ZAOBを求めよ。 XA=4, OB=6とするとき, OH をa, ōを用いて表せ。 p.400 基本事項回 重要28 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, AOAB の垂心Hに対して、OAIBH, OBIAH, ABIOH が成り立つ。 そこで,OAIBH 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=sā+tb 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章 4 H A 'B それ 解答 52+6°-72 12 1 (1) 余弦定理から coS ZAOB= 参考 |ABP=5-āP ーパ-25-6+2P IABI=7, āl=5, =6で あるから 7°=6°-25·ā+5° よって a5=6 60-。 三 2.5-6 5 (2) (1) から 1 a5=a||||cos ZAOB=5·6·==6 5 A0AB 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。 Hは垂心であるから OH=sa+tó (s, tは実数)とする。 『 OAIBHより OA·BH=0 である a-(sa+(t-1))=0 slaf+(t-1)a-5=0 OAIBH, OBIAH 0 垂直→ (内積)%3D0 (BH=OH-OB UD から よって a=5, à-5=6 B 25s+6(t-1)=0 の ゆえに A すなわち 25s+6t=6 O 垂直→(内積)3D0 また,OBIAHより OB·AH=0 であるから 6-((s-1)G+5)=0 (s-1)a-5+t5=0 AH=OH-OA よって -5-6, =6 6(s-1)+36t=0 すなわち s+6t=1 19 ゆえに 4O-2から 0, 2から 5 S= 24 24s=5 t= 144 195 a+ 144 5 したがって OH= また。 位置ベクトル、ベクトルと図形

中一英語です。 誰か教えてくれると嬉しいです😭 (英語苦手すぎて、、(ᯅ̈ ))

5.語 1) わた 2)彼 m 訳) tem 4) 訳) 3) We knew the new English teacher. 【否定文に】 訳) 4) Ken left home at 10:00. 【下線部をたずねる疑問文に) 0 00 訳) 5) My mother ran in the park yesterday. 【下線部をたずねる疑問文に』 bnebt bio mDy 訳) 4. 日本文に合うよう、[]内の語句を適切な順に並び換えなさい。 1)あなたはその店で何を買いましたか。[at the / buy / did / store / you / what / ? 」 2) あなたは昨日、野菜を食べませんでした。 [ didn't/eat / yesterday /you/ vegetables / . 」 3)昨年の夏、彼女はどこへ行きましたか。[did/ go/last / she / summer / where/?] 3

(2)の2行目で、「垂心Hは2点A、Bと一致することはない」と書いてあるのですが、なぜこのような記述をしなければいけないのですか？ 回答お願いします🙇‍♂️

練習| 平面上に △OABがあり, OA=1, OB=2, ZAOB=45° とする。 また, のOA=a, OB=あとするとき, Oをa, 5を用いて表せ。 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, OOO@ ふをHとする。 題24 aA=d, OB=b とするとき, OHをる, 五を用いて表せ。 AD.400 基本事項 重要 28 KOABの垂心Hに対して、OAIBH, OBLAH, ABIOH が成り立つ。 OALBH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+tbとし, OA·BH=0. OB-AH=0 の2つの条件から, s, tの値を求める。 'B 解 答 5°+6°-7 n 余弦定理から 12 1 CoS ZAOB= 参考 |ABf=6-āf =f-26-G+はP JAB|=7, ā|=5, 面36で あるから 7=6°-25-ā+5° よって -5=6 2-5-6 60 5 0 )から ·石=la||||cos Z AOB=5·6- 5 AOAB 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。 Hは垂心であるから OH=sa+ t5 (s, tは実数)とする。 0ALBHよりOA·BH=0 である a-(sa+(t-1))=0 よって saf+(t-1)a-5=0 OAIBH, OBIAH 0 ○垂直→(内積)%3D0 BH=OH-OE から H イl=5, a-6-6 B ゆえに 25s+6(t-1)=0 すなわち 25s+6t=6 A の O 垂直→(内積)%3D0 (AH=OH-OA また,OBIAHより OB·AH=0であるから あ(s-1)a+5)=0 よって (s-1)a-5+t6円=0 6(s-1)+36t=0 すなわち s+6t=1 ゆえに 2 -5-6, =6 0,2から 19 t= 144 4O-のから 5 S= 24° 24s=5 したがって 5 19 OH= これをいて 24 a+ 144 すと用いて 25 II

ケニアの森林が減った理由について、 30字いないで答えなさいの問題で私は ケニアに住む人が増え土地を覆っていた木を伐採したため。 とかにました。ピンになりますか??

|2 次の英文は, ワンガリ ·マータイ (Wangari Maathai) さんと, グリーンベルト運動 (the Green Belt number of people who lived there.. It wasincreasing every year. More people were cutting down the trees which covered_the land, They used them for *firewood when they cooked food So the forests in Kerya cannot get the firewood they need either. Forests also give food to many kinds of animals. They save the bare. The bare land cannot hold water, and cannot produce enough vegetables for the people. The people (anc Forests can hold a lot of water. If the trees in forests are cut down, the land becomes Maathai wanted to protect the forests in Kenya. She had an idea to make a group of people to plant trees. 第3回 cOvered こあかり Movement)について書かれています。各問いに答えなさい。 When she went back to Kenya, she got a shock. One of the *causes was the studied *biology in the U.S. when she was a young woman. In those days, the forests in Kenya were becoming smaller year after yeau 5 became much smaller while she was abroad. lives of people and animals. Soforests are very important. 10 She founded the Green Belt Movement in Kenya in 1977, She began to plant trees in order to prouet forests. There were many women working on the farms in villages in Kenya. They were very pooL, anat children were always hungry. They couldn't take good care of their children. Some of the children cou go to school. So Maathai wanted these women to join the Green Belt Movement. She began to work 15 the women. She *paid some money for their work. The money given to them wasa big help to make lives better. And that helped to make their children happier than before. At the same time, Maathai the women many things, such as how to read and write. They also learned that they could do somethin

7行目のasなんですか？whenでは？ 同時性ないと思うのですが

Part 2 After test-driving Vasco-5 in Japan, I saile across the sic Ocean to North America. The first city I visited was Vancouver, Canada. I asked for waste oil in many restaurants and hotels there However, my requests were often refused becaus. people knew little about biodiesel fuel. That mad: G-2) me feel disappointed. Still, as people heard abou Wena不古れ そ4 Orラ後の少る my project, they started bringing me waste oil fron

7行目のasなんですか？whenでは？ 同時性ないと思うのですが

Part 2 After test-driving Vasco-5 in Japan, I sailed across the Tesic Ocean to North America. The first city I visited was Vancouver, Canada. I asked for waste oil in many restaurants and hotels there However, my requests were often refused becaus people knew little about biodiesel fuel. That mad G-2) me feel disappointed. Still, as people heard abou Wena不古れ そ4 Orラ後の少る my project, they started bringing me waste oil from their homes. It took mea few days to process the al into biodiesel fuel. After the process was finished,

3224答え どれかひとつでもいいので解説お願いします。

They are now developinga plan to reduce the ( )number of cars using Route 6. 2 increases increasing 0 increase 3 の increasingly 開大 83 Students from the biology class ( ) on a field trip to the botanical gardens last Friday. 0 go 2 went have gone 4 will have gone 34 We can create a team ( )members work well together even though they seldom see each other. えN 0 who 2 whose と間 ③ whom の what 35 She was effective in advising college students about ( ) courses to take. 0 that 2 how when の which

この2つの写真を要約できる方いませんか？？ 教えてくれる方いませんか？？ お願いします😣🙏💦

次は, 戸田先生と友人のボブのメッセージのやり取りです。 アメリカ在住のボブは, 次の夏に向けて何か計画しているようです。 19:12 Hi, Koichi. Guess what! I'm planning a summer trip to Japan. Can we meet? I want to climb Mt. Fuji, stay in a mountain ei hut, and see the sunrise. Are you interested? [32 words 9se Idur-rUvllos

7行目のasなんですか？whenでは？

diesel Adventure Part 2 After test-driving Vasco-5 in Japan, I sailer across the iic Ocean to North America.n Th。 first city Iisited was Vancouver, Canada. I askei for waste oil in many restaurants and hotels there However, my requests were often refused becaus. people knew little about biodiesel fuel. That made G-2) whena希名れ t] me feel disappointed. Still, as people heard abou そ47 Aラ後少る my project, they started bringing me waste oil fron their homes. It took mea few days to process the il into biodiesel fuel. After the process was finished, was able to start on my journey again. When I ran of fuel, I stopped and asked people for waste oil again

英語の構文分析についてです butから分析を教えてほしいのですが inがどういう役割なのかがわかりません 教えてくださいお願いします。

more than 10,000 chicks lost, and the populatióh has lnot fecUVCICu, uuuuI study. Many gf the adults relocated nearby but/the fact that emperor penguins/are endangered in what had been considered the safest part of their habitat raises serious long-term concerns/ said Phil Trathan, a prominent British conservation biologist. It seems that the colony(at Halley Bay has all but disappeared.