丸している部分がなぜそうなるのか教えてください

内分する点 Sとする。 基本66 上」にもある (PQ, PRを で,「点S あるから =1, い。 3:1に を3点 き,線 稲田大] 四面体OABCにおいて, OA=AB, BC=OC, OALBC とするとき､次のこと 垂直, 線分の長さの平方に関する証明問題 を証明せよ。 00000 (1) OBLAC (浜松医大 ] 例題 68 直線(線分)の垂直 OA=4,OB=6, OC とする。 結論からお迎えすると OBLACOB AC=06⋅(c-a)=0 b·c=a·b 29 参照] のように、内積を利用してベクトル化することが有効である。 よって, OA=AB, BC=0Cから5c=a・b を導く。 ......... (2)等式の証明 ここでは (左辺) (右辺) = 0 を示す。 CHART 垂直・(線分) 内積を利用 ゆえに A, OB=1,OC=c とする。 (1) OA=AB 5 よって よって (2) OA²+BC" = OB²+ AC² →(内積)=0 [例題 30 参照], 線分の長さの平方→ABAB例題 =15-a |a|=|-20・6+\ap ゆえに ①②から 161²=2a-6 よって 同様に,BC=OC から |OA| = |AB|² = |BC|=|OC|子 161²=26.c って DB = 0, AC = 0 であるから したがって OB⊥AC (2) OABCから OA BC=0 OALBC à (c-6)=0 a∙b=b.c 3 ・(-a) = 0 すなわち OB･AC=0 SOBLAC a A ゆえに これと ③ より accであるから OA2+BC2(OB'+AC) 87-9-10 C b BEAT JUEGT DAX à•c=a•b CHA 基本29.30 (1) 別解 (p.486 補足事項 の例 参照) 0 =|0A|+|BC|-|OB-JAC にーーーー = lal²+|c²-26•c+|b1³² − | 6³² −|c³²+2à·c−laf=0 したがって OA2+BC2=OB2 + AC2 A----- 0A9=0A94 B (1) BC と AD も垂直であることを示せ。 (②2) 四面体 ABCD は正四面体であることを示せ。 485 M C 2章 9 (右) 位置ベクトル、ベクトルと図形 辺OBの中点をMとすると OA=AB から AM LOB OCBC から CM⊥OB よって OB⊥ (平面 ACM) AC は平面 ACM 上にあるか 5 OBLAC 一部 =1c1²-26-c+161²2 [ 四面体 ABCD を考える。 △ABCと△ABD は正三角形であり, AC と BD とは 968 垂直である。 [岩手大]

ここのchangeの文はchange fromA to Bという構造だと思うのですが､ toのところに動詞使って良いんですか？

10 persons extended their right hands to show the 3 It is not known when and why the handshake changed from a simple *clasping of hands to include a shaking movement. This and hands probably started as early 1

至急答えを教えて頂きたいです🙇‍♂️🙇‍♂️🙇‍♂️

26 LESSON 7 1 Choose the best answer to fill in the blanks. (1) (1) Peter ( ) for ten years next month. she 1 teaches 3 will teach 900 (3) Our teacher is ( 1 likely the (4) My father is ( 6 more tall (2) In my class, there are three students from abroad. One is from England and ( are from Australia. another here ℗ to my climbing 3 me to climbing (8) ( Din (5) My parents objected ( & triguod ad 2 others 1 Judging from 3 Though (6) She had to shout to make herself 2 hear I have heard 2 will be teaching 4 will have taught 3 the other ) to come by the time we promised to get together. 2 possible 3 probable 4 definite ) of the two men standing at the gate. M 2 taller 3 the tall /30 (7) The project could be called a success, all things ( 1 consider 2 considered 3 considering (10) We are now in the ( (1) late about ) the mountain alone in winter. ) the sky, it will rain this afternoon. ). 3 heard (11) All teachers and students are not ( 1 necessarily 2 necessary 4 the others ) half of our training camp. 2 latter 3 later 4 the taller IACISTU \ion) sem 2 me of climbing 4 on me to climb JJ: 7-ASRE 4 hearing 2 Generally speaking 4 It being 4 to consider (9) You must leave now; ( ), you will be late for your social studies class. 1 instead 2 therefore 3 otherwise 4 accordingly 4 last ) wise and hardworking. 3 need 4 needed St (12) ( ) had the war begun when terrorists hijacked a plane. 1 The moment 2 No wonder 3 Hardly 4 As soon as (京都産) (関西学院 (13) Next week's seminar ought to provide ( ) with a lot of new information. 3 ourselves 4 us 1 ours (2 our THIO (千葉工 (近畿 AS-ARSTORSHAN (実践女 (摂 (大阪学 (センター (國學 (55) (二松学 (tale

大門2の全6問合ってますかー？

2 ( )内の語句をS+V+O+C の語順に並べかえて文を完成させ, 日本語で表しなさい. 6 PICTIVO BOTE Cyc (Tommy, we, him, call). [訳: DENCO (2) (kept, we, secret, the plan). [訳: ring (3) (painted, Fred, black, the fence). [訳: (4) (very difficult, found, I, the problem). [訳: (5) (named, they, Alice, the baby). [訳: (6) (us, made, the news, very happy). [訳: 29060 310 Aromal visvai gnitoinq zid 19 753230330 BEZAHORUS new ter SE 1 1 ] ] ] ]

高校生　生物　結晶 六方最密構造の原子数についてがよく分かりません。 1枚目の写真では 『中心付近1×3』となっていて、赤いマーカーの原子が1つずつということを表していると思うのですが、 2枚目の写真では 『あわせて1個』となっていて、青いマーカーの残り一つが何個文を... 続きを読む

六方最密構造 | 単位格子に含まれる原子の数 AI E H F LL 色の部分が単位 格子になる。 ⑩ 六角柱に含まれる原子の数 1/8 (頂点)×12+1×3(中心付近)+1/21(底面)×2=6〔個〕 単位格子に含まれる原子の数 単位格子は、図の六角柱の 1/3 の四角柱 ABCD-EFGHになる。 単位格子に含まれる原子の数は、6個× - x 1/23-2個となる。

(3)と(7)と(9)(10)の解き方が分かりません。 答え2枚目です

12 【酪農学園 2013年度 後期】 3. △ABCにおいて AB=2, AC=4, ∠A= とする。 AB, BC, CA を : 1-t (0<x<1) の比に内分する点をそれぞれD,E,Fとし, 頭, 印のなす角がそのとき, △DEF の面積を以下の手順で求める。 空欄の(1)~00)に式または値を入れよ。 「EDをBC, BA, tを用いて表すと, ED= (1) [BC+ (2) となり、同様に、EFをBC, BA, tを用いて表すと, EF= (3) IBC+ (4) となり、 である。また、辺BCの長さは、BC= BAとBCの内積の値はBABC= (6) である。 よって、内積ED・EF をtの2次式で表すと EDEF (7) (8) BA S= (10) と求まる。」 BA (5) であるので, と求まる。 辺EF の長さは EF= (9) であるので,△DEFの面積をSとおくと,

問題を解いたのですが答えが分かりません( ˘•ω•˘ ).｡oஇ 教えてください🙏

4 「大人になると失われる赤ちゃんの能力を維持する方法 These recent studies have certainly changed the traditional image of babies: they know nothing and cannot do anything. If we try to sustain babies' abilities into adulthood, we may be able to improve our capacity as human beings. For example, if Japanese babies are exposed to English along with Japanese, they may be able to hear the difference between "r" and "1" sounds even when they become adults. 8 11 five senses !? 日本の赤ちゃく Part 7 many 10 Parents in the U.K. often make "treasure baskets" for their babies. They are baskets with items that will appeal to babies' five senses. Seeing, touching, hearing, smelling, and tasting may stimulate children's sensitivity to their environments. Parents believe that treasure baskets will help babies keep their innate cognitive power as they grow up. 9 These are just two examples. It is time that we should look at babies' capacity more carefully so that we can learn from them and realize our potential more fully. 15 cognitive power 5 Ata 15 sustain [sǝstéin] adulthood [ǝdálthùd, adal capacity [kəpæsəti] Cc E basket(s) [bæskit(s)] item(s) [áitəm(z)] appeal [ǝpí:]] stimulate [stímjulèit] sensitivity [sènsətívəti] innate (inéit] fully [fúli] C

問題を解いたのですが答えが分かりません。 教えてください🙏

Part 3) 赤ちゃんの脳の中で何が起こっているのでしょうか。 6 Why do babies have such amazing abilities? There is no established theory, but the study of the brain gives us a clue. Brain development is the process of creating and discarding connections among the neurons. These connections are called synapses. The development of synapses occurs at an astonishing rate during babies' early years. At its peak, two million synapses are created per second. By the age of three, their brains have about 1,000 trillion synapses, many more than they will ever need. Some of these synapses ¹0 remain intact, but many are gradually discarded. Babies will keep enough synapses to use for the rest of their lives. established [istábliſt] theory [01:əri] discard (ing) [diská:rd(in)] connection(s) [kənék fən(z)] neuron(s) [njúəran(z)] synapse(s) [sínæps(iz)] astonishing [ǝstánifiŋ] rate [réit] peak (pí:k] per (pó(:)r] trillion [triljon] intact [intækt]

問題を解いたのですが答えが分かりません😭 教えてください🙏

Part 2 4 some In addition to these physical capabilities, experimental results show that babies' intelligence is often superior to adults'. Because of the way human brains develop, six-month-old babies are better at recognizing certain faces than adults. But there is a 5 catch: it is non-human faces that they really excel at recognizing. In another study, researchers discovered that six-month-olds had no problem distinguishing individual monkeys, although they look almost the same to adults. NIVEL どんな点で赤ちゃんは大人よりも優れているのでしょうか。 10 5 Researchers have also found that babies, before six months of age, have the ability to hear and distinguish between almost all the sounds of human languages. That's about 150 sounds in about 6,500 languages! For instance, Japanese babies can hear the 15 difference between "r" and "1" sounds, which adult Japanese find difficult to distinguish. This ability will disappear gradually as they learn their native language, Japanese. capabilities (kelpabila <capability keipobilan experimenta liksperament intelligence (inteladzana) superior [saplariar recognizing (rékagnaizin) <recognize (rékagnaiz) non-human \nànhjú:man excel [iksel] distinguishing [distingwif(in) idiom 2 be superior to 8 six-month-olds = six-month-old babies 5 there is a catch ここには留意すべき点があります !? 赤ちゃんの際の記憶が定かでないのは、人の記憶は3歳以降に定着するためであるという説があります。

問題を解いたのですが答えが分かりません😭 教えてください！

Part 7 生まれたばかりの赤ちゃんは何もできない,というのは本当でしょうか。 People used to 1 Babies are full of mysteries. think they could do nothing by themselves except breathe, eat and sleep. These days, however, new discoveries about babies show us that they have much greater abilities than most people think. 1B 2 Recent research findings in brain science and cognitive psychology make it clear that babies are not necessarily born with clean slates. For example, they remember some sounds which they heard in the mother's womb. Sounds in the womb are usually muffled, but the melody and rhythm of musical sounds are not much altered. 3 Surprisingly, babies sometimes can naturally do what adults think babies cannot do. Do you believe that babies are born with the ability to hold their 15 breath in the water and swim? Some researchers studying the dive reflex in 21 infants between four and twelve months old found that none of them inhaled water or choked 20 during "diving." They naturally moved their Baby clean ciates 白紙の状態で 15 hold one's breath 後間もなくから1歳くらいになるまでの赤ちゃん 5 10 arms and legs in a swimming motion. discoveries [diskávəriz) <discovery [diskávəri] finding(s) [fáindiŋ(z)] brain [bréin] cognitive [kágnətiv] psychology [saikálǝdzi] slate(s) (sléit(s) womb (wú:m] 17 dive reflex muffle(d) [máfl(d)] rhythm (ríom alter(ed) [5:ltər(d)] surprisingly [sərpráizinli] naturally [nætfərəli] breath [bré0] researcher(s) [riss:rtfər(z)] Co reflex [rí:fleks] infant(s) [infənt(s)] inhale(d) [inhéil(d)] choke(d) [tfóuk (t)] C motion (mouf