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数学 中学生

なんでこうなるのかが分かりません 明日受験なので早めに教えてください

与式を順に7) (イ)とする。 (ア)× 2 +(1)より, x =-2 これを(ア)に代入して, 3 ×(- 2) + y = 1より,y=7 18-(2017年)神戸国際大高 2017年度/解答 数 学 I[解き方】① 与式= - 15+ 17 = 2 7 1 10 3 2 の与式= 5 15 15 3 15 の与式= 2V5- 3V5 + V5= 0 の与式= 4 -6-3z + 12 = z +6 の与式= - (2a+ 36) (2a - 36) = - (4a° - 96?) = - 4a^ + 96 和が- 2, 積が-15となる2数は3と-5なので, 与式= (z + 3) (z - 5) の両辺に6をかけて、 4z - 6 = 3z - 3 + 2より, 2=5 -2+ 2V2 -2±V2? - 4×1×(-1) 2×1 =-1± V2 9解の公式より, エ= 2 鉛筆4本の代金は, a×4= 4a (円), ノート 5冊の代金は、6×5= 56 (円)だから,4a + 56s 1000 よって、中心角と円周 1 = 90° 4 3 11 D (1) BCの長さは円周の, 12 なので、中心角の大きさは, 360°× 4 1 75° 角の関係より,ZA = 90°× 45°(2) 同様に,ZB = 360°× 2 1 5 (3) 同様に,ZC = 12 2 4 360°× 11 = 60° 12 2 7 【答】の2 の 30 Or+6 ⑤ - 4a° + 96? ⑥ (r + 3) (x - 5) ⑦ r=5 15 8(z =)-2 (y =)7 ⑨r=-1± V2 0 4a + 56< 1000 ① (1) 45° (2) 75° 2 【解き方】 のそれぞれのさいころの目の出方は6通りなので, 6 ×6×6= 216 (通り) ② (a, b, c) = (1, 1, 3), (1, 2, 2), (1, 3, 1), (2, 1, 2), (2, 2, 1), (3, 1, 1)の6通り。 ③a, b, cのすべてが5より大きくなる, つまり, すべての目が6になるのは1通りだから, a, b, cのうち、 (3) 60° 少なくとも1つが5以下になる場合は, 216 - 1 = 215(通り) よって, 求める確率は 215 216 . 5), (3. 4, 6), (3, 5, 6), (4, 5, 6)の 20通り。 よって, 求める確率は, 20 215 216通り ②6通り ③ | 5 216 5 54 216 54 き方】 ①2点A. Cはy軸について対称なので, 点Cの座標は B1BCの傾きは、 (--2)11- -2- 11-(-2){ = だから、直線BCの式を の座標を代入するk

解決済み 回答数: 2
化学 高校生

問3で、(う)に当てはまる値を求めよ。という問題なのですが、解説に書いてあることがよくわからないので教えていただきたいです

北海道大-理系前期 2017年度 化学 33 北海道大一理系前期 ミ("r- Vr) 96 2 2017年度 化学 1化学 2 い) k/mol であることから、xn-xal= 0.98 とな 239 kI/mol および n= 2.05とすると。 ,反応熱から (2科目 150 分) (う)となる。また。結合エネル Xa= る。ここで,XH (あ)の差を求めることが可能で ギーがわからない場合でも、 はすべて各問題の指示にしたがって解答用紙の該当欄に記入せ」 の値をもとにして、各原子の 一原子分子の極性の大ささは, ての分子の電気双極子モーメントィでナー めることで実験的に決定できる。例えば、原子間距離がLである二覧 (あ) を決定した。 れば大の数値を用いよ。 Br = 80 ファラデー定数:9.65 × 10*C/mol 分子の電気双極子モーメントの大きさはL-qとなる。したがって、電在 メントと原子間距離から分子中の原子の電荷量を見積もることができ 0℃の絶対温度:273 K る。 あ) 1| 1.Iに答えよ。 の差の大きな原子同士はイオン結晶をつくりやすい。イオン結晶 由の陽イオンと陰イオンの間の結びつきの強さは,格子エネルギーと呼ばれる 店の大きさで評価できる。例えば,塩化ナトリウムおよび塩化リチウムの格子 I 次の文章を読み、問1~問7に答えよ。 二つの異なる原子からつくられる共有結合において, それぞれの原子が共有 エネルギーは、それぞれ熱化学方程式3および4)の反応熱Q.0KDおよび とよび、 電子対を引きつける強さの指標を つの原子からなる結合は極性をもつ。ポーリングは,原子AとBのつくる Q:(kDで与えられる。 Na*(気)+ CI-(気) =D NaCl (固) + Qi(kD (あ) (あ) に差のある二 合A-Bの極性の大きさと結合エネルギーの相関に注目した。ここで、原子A とBがつくり得る3種類の結合A-A, B-BおよびA-Bについて,結合ェ Lit (気)+ CI-(気) = LICI (固)+ Q:(k) 4) ここで、Q」-Q2= (え) 灯であり,結晶中でのイオン同士の結びつ ネルギーがそれぞれD(A-A), D(B-B), D(A-B) であるとする。極性をも きは (お の方が強い。この結果は,イオン結晶中での陽イオンと陰イオ つ結合A-Bでは、部分的なイオン性による安定化があるため,結合エネル ンの結びつきは主に静電気力に由来し, イオン結晶の格子エネルギーのおおよ m) ギーが大きくなるとポーリングは考えた。その考えによれば, 結合A-Bの極 性が大きいほど,式Iに示すD(A-B)と,D(A-A)およびD(B-B)の平均値 との差4は大きくなる。そこで, A とBの Iとし、その差を式2によって定量化した。 その大きさが、構成する陽イオンと陰イオンのイオン半径の和と価数によって 決まることからも理解できる。 (あ) をそれぞれxおよび 問1 (あ) にあてはまる適切な語句を記せ。 4= D(A-B) - DA-A)+ D(B-B) 2 (kI/mol) 問2 (い) にあてはまる値を有効数字2桁で答えよ。

解決済み 回答数: 1
英語 高校生

QuestionAとBの1について、私の回答で丸はもらえますか?教えていただきたいです 北大2017年の英作文の問題です。

Read the following passage. for my age. I leave home early and it takes about two hours on a crowded train to get to the office. I get Sunday off, but on the other days I'm usually in my office till nine o'clock, or even midnight on occasion. But I enjoy seeing the customers excited about our new products and services. Every August I take a 15 years. It's a secure job in a major company and I enjoy a relatively high salary six-day summer vacation, usually at my parents' place in Toyama. It's nice to Thave been working for a Japanese cell phone company in Tokyo for the last 2017年度(3] 32 a or the space of the countryside after my cramped apartment in the suburbs. However, I spend two days travelling there and back, and then it's straight back to work the next day. Last summer, however, I was able to take 10 days off in August and used the rare chance to take my wife on a foreign holiday by going to visit my old friend, Pierre, in Paris. He and I met at university in the US nearly 20 years ago when we were both international exchange students. We shared a love of tennis and S0on became good friends, and have stayed in touch. He now works as a supervisor in a post office in eastern Paris. It was lovely to see Pierre again and spend time in the spacious apartment he shares with his wife. I was very surprised to find that they were just back from a month-long summer vacation in southern France and Switzerland. Pierre told us that this is perfectly normal in his job, and couldn't believe his ears when I mentioned that my usual vacation is around a week and that I work 12 hours a day, six days a week. His usual workday, he said, was from 9:00 to 16:00. He wasn't joking ; he was back home by bicycle by 16:20 every day. He likes his job as the postal service fulfills a vital function in society by connecting people both aomestically andinternationally. On hearing his story, though, I began to reflect upon my own life and work. AmI working to live, or just living to work ? Answer questions A to C in English. You may use words and ideas from the Lext, but you must not copy complete sentences.

回答募集中 回答数: 0
英語 高校生

広島大学の二次試験対策について質問です。 去年から新しく2個の資料から問題を解く形式に変わりました。慣れるために問題を解きたいんですが、去年の分しかありません(TT) 2個の資料を用いて問題を解いていく形式の長文がある大学の過去問を知っていたら、教えて欲しいです! ↓写真... 続きを読む

(I] Read the following two passages and answer the questions. 資料1 A cave-wall depiction of a pig and buffalo hunt is the world's oldest recorded story, claim archaeologists who discovered the work on the Indonesian island Sulawesi. The scientists say the scene is more than 44,000 years old. The 4.5-metre-long panel features reddish-brown forms that seem to depict human-like figures hunting local animal species. Previously, rock paintings found in European sites dated to around 14,000 to 21,000 years old were considered to be the world's oldest clearly narrative artworks. The scientists working on the latest find say that the Indonesian art predates these. Such artworks are notoriously difficult to date because they can be made with raw materials, such as charcoal(注1), which can be much older than the paintings themselves. But scientists excited the archaeological worid when they reported, in 2014 and 2018, that caves in Sulawesi and Borneo held artworks, including animal paintings, which were older than 40,000 years. The panel seems to depict wild pigs found on Sulawesi and a species of small-bodied buffalo, called an anoa. These appear alongside smaller figures that look human but also have animal traits such as tails and long noses. In one section, an anoa is surrounded by several figures holding spears and possibly ropes. The depiction of these animal-human figures, known in mythology as therianthropes (注 2), suggests that early humans in Sulawesi had the ability to conceive of things that do not exist in the natural world, claim 2 the researchers. The oldest such example from Europe is a half-lion, half-human ivory figure from Germany that researchers have estimated to be 40,000 years old-although Some suggest that it might be significantly younger. A roughly 17,000-year-old painting of a bison chasinga bird-headed human, from Lascaux Cave in France, is considered to be one of the earliest depictions of a clear scene in European rock art. To determine the age of the hunting scene, researchers led by archaeologist Maxime Aubert, at Griffith University, Australia, analysed calcite (注 3) 'popcorn' that had built up on the painting. Radioactive uranium in the mineral slowly decays into thorium. So by measuring the relative levels of different isotopes (往0 of these elements, the researchers were able to determine that calcite on top of one pig began forming at least 43,900 years ago, and deposits (注 5) on two anoas are older than 40,900 years. The dating gives scientists clues about the origins of figurative art. "t has always been assumed that the tradition of figurative painting arose in Europe," says Alistair Pike, an archaeological scientist at the University of Southampton, UK. "This shows the tradition does not have its origins in Europe." But he notes that the researchers dated only the portions of the painting that show animals, so it's possible that the therianthropes were added later. Aubert says the team did not find calcite samples over the therianthropes. Aubert thinks the animals and the therianthropes were painted at the same time. They are of similar colour and weathered in the same way, he notes, and all the other cave art from the region is from the same time period. Archacologist Bruno David, at Monash University in Melbourne, Australia, agrees with Aubert's interpretation. If the entire painting is more than 44,000 years olid, it could mean that early humans arrived in southeast Asia with the capacity for symbolic representation and storytelling. David argues. Archaeologists have already found paint palettes and objects such as eggshells with abstract engravings made by early humans in southern Africa, he adds. “'s probably only a matter of time before narrative paintings of this, and much older age, are found in Africa." (Adapted from Nature, December 11, 2019) (注1) charcoal 木炭 (注2) therianthrope 獣人 (注3) calcite 方解石 (注4) isotope 同位体 (注5) deposit 付着物

解決済み 回答数: 1