赤い四角で囲ってあるところがわかりません💦 メネラウスを使えるところがわからなくてどうしても解けません💦　解説お願いします！ メネラウスが使えるところを見つけても求めたい辺の比が求められないのですが、どうしたら良いでしょうか？　 見つけ方も教えて頂けるとありがたいです🙏

680 1辺の長さ1の正三角形ABCにおいて, BCを1:2に内分する点をD. CAを1:2に内分する点をE, ABを1:2に内分する点をFとし、更に BE と CF の交点を P, CF と AD の交点を Q, AD BE の交点をRとす る。 このとき, △PQR の面積を求めよ。 ⑥ 75

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PAR Review 5 (Point 131~157) to smo r ■ QAZ- GREL 131~157) 形容詞の語法, 副詞の語法,比較 ETC 英文中の空所に入る適切な語または語句を選択肢から選びなさい。 2. There was hardly ( 1 more 1. Many students were not able to solve the problem, but ( ents wer 1 few ble to so 2 a few 3 little 3. Ken didn't work as ( 1 hard 3 hardest 4. He has a great ( things usd 1973 7. Your plan is ( 17. Ⓒ less do ) rainfall in that area of the country. 2 some 3 no 4 any slɔ od ai (-) ant eslood om hans and sil2 (dytas) ) were. O TOC Besides ) of knowledge about languages. sie o 2 deal 3 quality 形容詞の語法, 副詞の語法, 比較 viilsup ai ) as his brother, and he failed in the final exam. es dou 3 pleased *080 6. Ellie has to finish her project by next Monday. boss. 1 Except ) better than mine. 12 far to excite 5. The singers seemed a little too () with their success. be pleased 2 be pleasing July 11. The news was (\) to us. 21. Ⓒsurprise 2 more seriously 4 many serious 2 excitement PILN 2 surprised on bed anellob svit 4 a little 3 more 10. The school is strict about hair styles; ( (1 moreover 2 otherwise 3 Additionally (B2), 4 ) (0) die Gl and number gaigbulafe 3 surprising TOXOX bubong eidT) Vino 4 too 4 Otherwise 131 (東海大) um coM as 146 blaw edi buona 〈 名古屋学院大 > Har \ gad) 本日132 4 pleasing 〈 近畿大 > 185 she will get in trouble with her 8. A friend of mine is coming to Japan next month. I am very ( ) about the news. ➡132 1 excite (3) excited 4 exciting <東海大 > LOW LAW 304 3 exciting 4 excitable 1940 inging yM AUTO ), some students break the rules. 3 nevertheless 4 notwithstanding ro sniqgsH 9. By the time it ended, our team had battled hard and finally won. The game was indeed ( ). 10 excited 142 ➡131 <杏林大〉 ② 次の英文の 1. Count day. 4 to surprise JanoviaU bolx0 144 < 南山大 > 150 1) I bsando gli om man soad sms I asdW <玉川大〉 132 〈北里大〉 145 〈法政大> 132 <京都学園大 > REST ③ 次の日本 01. 1 Sh 2. Of 3. Alice □ 2. そ C ☐ 3. □ 4.

英検対策の問題です。 中１なのですか分からないとこばっかりで…。 解説も出来れば、出来ればでいいので お願いします🙇‍♀️⤵️

13 (1) から (15) まで ( 1つ選び、その番号のマークをぬりつぶしなさい。 (2) (1) A: Mike, have you called Jill to tell her about our meeting tomorrow? B: No, not ( 1 yet ―次試験 筆記 ). I'll call her after lunch. 2 over 3 always Brian is going to visit the (> ) with his class next week. He wants to see many kinds of fish there. 1 college 4 garage 大学 EL (3) A: These are delicious tomatoes. B: Thank you. We ( 1 grew に入れるのに最も適切なものを 1,2,3,4の中から 2 aquarium 3 stadium *17 (7) A: It's so hot! 2 thought 2 special (6) Helen and Yumiko ( they're good friends. 1 put (4) Jeff went fishing on Sunday. He caught nine fish. One was very big, but the () were small. 1 another 2 ones 3 others 4 sometimes (5) A: I heard that you're going to Rome next week. B: That's not ( ). I'm going to Paris. 1 true 2 thought ) them in our garden. 3 fought 4 knew 4 all 3 met 3 common 4 main 3) in the tennis club at school. Now 4 found B: Here, use this (2). It will cool you down. 2 fan 3 hill 71% 1 line 4 head 頭 75 78 (8) People think I can speak French because my mother is from France. But (A ) fact, I can only speak English. 1 by 2 on f 3 for 4 in (9) The rock group was very popular, so the concert hall was 3) of people. ( 1 thick 2 full 3 deep 4 high (10) Lisa and her family didn't go ( planning to go on a trip this year. 1 away 2 at B: OK. 1 pass (11) A: I told my mother that I would be home by 7:00. I don't ) my promise, so I have to go now. want to ( 2 se 4 lend 2 color 3 through 4 behind (12) Jim bought a new house, so he had to move his things. All his friends were on vacation, so they couldn't give him a (/). 1 part ) last summer, so they're 3 break (13) A: Excuse me. Could you tell me ( map? 2 won't 3 front (14) A: Jack is a police officer, (3 B: No, he's a doctor. 1 isn't 2 to teach B: Sure. There's a bookstore on the fifth floor. 1 which 2 why 3 what 4) I can buy a world ) he? 4 hand 3 doesn't 3 teach 4 where 4 can't (15) I can't ride a bike, but my brother can. I asked him (3) me. 1 teaches 4 taught 19年度第1回 記

原子量の有効数字の桁数はそれぞれ違いますが、これは暗記ですか？

表2 同位体の天然存在比と原子量 元素 水素 炭素 酸素 扇子 同位体 相対質量 天然存在比 〔%〕 原子量 原子量 (概 1.0078 99.9885 1.0079 2.0141 0.0115 銅 ¹H 2H 12C 13C ナトリウム アルミニウム 27AI 35 CI 塩素 37 Cl 160 170 180 23Na 22.990 26.982 34.970 36.966 12 (基準) 13.003 63 Cu 65 Cu 15.995 16.999 17.999 62.933 64.928 98.93 1.07 99.757 0.038 0.205 100 100 75.76 24.24 69.15 30.85 12.011 15.999 22.990 26.982 35.454 63.548 1.0 12 16 23 27 35.5 63.5

この計算式で、どうして27.3になるのか分かりません。途中式教えてください。

解答 (1) 27 (2) Fe2O3 解説 (1) 元素Xの原子量をxとすると, 酸化物X2O3 の式量は, -2x+16×3=2x+48 2X X203 x100= Fe FeOx x=1.5 2x 2x+48 x=27.3 (2) 鉄の酸化物の組成式を FeOx と置くと, 56 x 100=70 56+16x x100: x 100=53

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次の英文の空所に適語を入れ、 付加疑問文を完成させなさい. (1) Mr. Kimura isn't in the teachers' room now, (2) It's going to rain this afternoon, (3) Your parents were in London last summer holiday, (4) Saki participated in the speech contest last week, (5) Your brother has a lot of classical music CDs, (6) Mr. and Mrs. Tanaka have not arrived in Nagoya, (7) Naomi won't be back by 7 o'clock, (8) The little girl will be able to swim soon, (9) Study English harder, (10) Let's take a rest when you finish your homework, ? ?

答えが違うところが合ったら解説お願いします

A ( )に入る最も適当なものを選びなさい。 1. Take the number 8 bus and get ( 4 on 3 off 2 down away ) this application form. 2. Please fill ( 4 to 3 on 2 in Qwith 3. Soccer is very popular ( 1 to 2 at 3 among 4. Don't forget to write ( 0 down 2 off ) Japanese students. 4 between ) when and where we will meet next. Oby 4 away ) early hours will live long. 5. Those who ( rise 3 have 4 keep take 6. She persistently asked her son to clean ( 0 on 3 off 4 up down 7. The international conference ( 0 held 14, I saw ( ☐8. I ( 1 got 9. Kathy is ( 0 pride of 10. I haven't ( heard from 2 listened from 11. I want such silly rules to be ( taken removed 3 cut 12. His name is known ( for 2 to with ) cancer last year. LESSON 1 13. My father died ( 0 of 2 on 3 with 4 in 2 LESSON 1 took hold 3 organized ) a very good time in New York. 2 stayed Ⓒoff him at 15. Please try to ( take get ) the bus stop. ) at Forest Road. ) in May three years ago. 4 took place ) his room. had 4 passed ) never having been late for school. pride in 3 proud in 4 proud of ) my girlfriend for more than three months. him off 3 off him from ) the best use of the time left. 3 make 4 pay (愛知学院大 ) 4 him off at (福岡大) 3 received from 4 talked from ) away with. 4 done ) everyone in our town. 4 in (東海大) ( 桃山学院大 ) (札幌大女子短大) (駒沢大) (南山大) (上智大) (愛知学院大 ) (大東文化大) (愛知県立医療技術短大) (流通科学大) (福島大) (名古屋外語大) (愛知学院大短大)

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TRY! 次の日本語に合うように に適当な語を入れなさい . ① この問題を解くのは難しい. ) is difficult ( ② 彼女の仕事は外国人留学生に日本語を教えることだ. Her job is ( )( students. ③ あなたはゴルフのやり方を知っていますか. Do you know ( ) ( )solve this problem. ⑤ 心配することは何もない. There's nothing( I'm scared. ) Japanese to international ④ 彼はドアの鍵を開けるのが不可能だとわかった. He found ( ) impossible ( door. )play golf ? )worry( ) unlock the ). ・ ●

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4 20 科学 420 words Chapter 1 The recipe for making any creature is written in its DNA. So last year, when 1-1 geneticists* published the near-complete DNA sequence of the long-extinct woolly mammoth, there was much speculation about whether we could bring this giant creature back to life. 5 東京理科大学 Creating a living, breathing creature from a genome* sequence that exists only in a computer's memory is not possible right now. But someone someday is sure to try it, predicts Stephan Schuster, a molecular biologist at Pennsylvania State University and a driving force behind the mammoth genome project. So besides the mammoth, what other extinct beasts might we bring back to life? Well, 12 10 it is only going to be possible with creatures for which we can recover a complete genome Without one, there is no chance. And usually when a creature dies, the (1) - DNA in any flesh left untouched is soon destroyed as it is attacked by sunshine and bacteria. sequence. There are, however, some circumstances in which DNA can be preserved. If your 15 specimen froze to death in an icy wasteland such as Siberia, or died in a dark cave or a really dry region, for instance, then the probability of finding some intact stretches of DNA is much higher. Even in ideal conditions, though, no genetic information is likely to survive more than a million years. - so dinosaurs are out and only much younger remains are likely to yield good-quality DNA. "It's really only worth studying specimens that are less than 100,000 years old," says Schuster. The genomes of several extinct species besides the mammoth are already being sequenced, but turning these into living creatures will not be easy. "It's hard to say that something will never ever be possible," says Svante Pääbo of the Max Planck Institute 25 for Evolutionary Anthropology in Germany, "but it would require technologies so far removed from what we currently have that I cannot imagine how it would be done." But then (3) 50 years ago, who would have believed we would now be able to read the instructions for making humans, fix inherited diseases, clone mammals and be close to creating artificial life? Assuming that we will develop the necessary technology, we have 30 selected ten extinct creatures that might one day be resurrected. Our choice is based not just on practicality, but also on each animal's "charisma" - just how exciting the prospect of resurrecting these animals is. 1-3

数2の直線の問題なのですが、 なぜ、k（2x +3y−7）＋（4x＋11y−19）＝0という式になるのか分かりません。 教えて下さい🙇‍♀️

ず 較法) 入法) 成立 の恒等 9=0 題78で 点を通る これら! である 購入 こする 基本例題 78 2直線の交点を通る直線岡市 2直線 2x+3y=7 ①, 4x+11y=19 る直線の方程式を求めよ。 SOLUTION 2直線 f(x,y)=0, g(x,y)=0 の交点を通る直線 方程式 kf(x,y)+g(x,y)=0(kは定数) を考える.. yで表される式をf(x,y) などと表す。 x, 問題の条件は2つある。 CHART 解答 kを定数とするとき、次の方程式 ③は, 2直線①, ② の交点を通 る直線を表す。 k(2x+3y-7)+(4x+11y-190) (3) ③点 (54) を通るとすると､ ③にx=5,y=4 を代入して [1] 2直線 ①, ② の交点を通る [2] 点 (54) を通る そこで,まず,①,②の交点を通る直線 (条件 [1]) を考え,次に,この直線が点 (5,4)を通る (条件 [2]) ようにする。 15k+45=0 これを③に代入すると 整理すると x-y-1=0 よって ① ･･････ ② の交点と点 (54) を通 [p.115 基本事項 5. 基本 77 19 11 0 73 19 (5,4) k=-3 -3(2x+3y-7)+(4x+11y-19) = 0 別解 2直線①, ② の交点 の座標は (21) よって, 2点 (2,1),(5,4) を通る直線の方程式は y=1==2(x-2) すなわち x-y-1=0 (INFORMATION 2直線の交点を通る直線 交わる2直線ax+by+c=0, azx+by+cz=0 に対して k(ax+by+ci) +ax+bzy+c2=0 (kは定数).... (*) は,kの値にかかわらず2直線の交点を通る直線を表している。 (ただし,直線 ax+by+c=0 は除く。) 2直線の交点 (x,y) は, ax+by+c=0, ax+bzy + C2 = 0 を同時に満たす点であ るから, (*)はんの値にかかわらず成り立つ。 すなわち, (*)は2直線の交点を必ず 通る直線になる。 この考え方は直線以外の図形を表す場合にも通用するので,応用範囲が広い。 3章 11 直線 PRACTICE･・・ 78③ 次の直線の方程式を求めよ。 (1) 2直線x+y-4=0, 2x-y+1=0 の交点と点(-2, 1) を通る直線 (2) 2直線x-2y+2=0, x+2y-3=0 の交点を通り, 直線 5x+4y+7=0 に垂直 な直線 LA ノ-836BT 6mm ruled x36 lina