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数学 高校生

(1)の赤字で書いてある式の意味が分かりません。 教えてください🙇‍♀️🙇‍♀️

基本例題 46 次の確率を求めよ。 (1) 1枚の硬貨を4回投げたとき,表が続けて2回以上出る確率 (2) 1枚の硬貨を5回投げたとき,表が続けて2回以上出ることがない確率 p.329 基本事項 CHART & SOLUTION Mamuje 3つ以上の独立な試行 ((1) は4つ (2)は5つの独立な試行) の問題でも, 独立なら 積を計算が適用できる。 また, 「続けて ~回以上出る確率」の問題では,各回の 結果を記号 (○やx) で表して場合分けをすると見通しがよい。 (1) 何回目から表が続けて出るかで場合分けする。 (2) 「~でない」 には 余事象の確率 解答 各回について、 表が出る場合を○, 裏が出る場合をx, どち らが出てもよい場合を△で表す。 (1) 表が2回以上続けて出るの 1回 2回 は、右のような場合である。 よって, 求める確率は (1/2)×1°+(1/2)x 連続して硬貨の表が出る確率 3 + 1 × ( ²2 ) ² = = 1/1/2 3 5 19 +(+4)=32 3 ×12+1 5 よって、求める確率は 19_13 1 32 32 5 OXOX OX (2) 表が2回以上続けて出る 1回 回 3回 4回 5回 のは、右のような場合であ り, その確率は (12/2)x1°+(1/2)×1 ×(1/2)x1+(1/2)+(1/2) × × OOX × × O 〇〇 × O × XXOOD × × 3回 × AOO ○ 4回 A △ AAOOOO AAAO00 O ← 1回目から続けて出る。 ← 2回目から続けて出る。 3回目から続けて出る。 (2) 余事象の確率。 ← 1回目から続けて出る。 ← 2回目から続けて出る。 3回目から続けて出る。 ← 4回目から続けて出る。 ○○×○○は1回目か ら続けて出る場合に含 まれる。

解決済み 回答数: 1
英語 中学生

英語の長文問題で、自分の回答が模範解答と少し違かったので質問したいです。自分の回答は合っている答え方ですか。

次の英文は,中学生の浩 (Hiroshi) , 高校生の直人 (Naoto) とサイクリング (cycling)に出か *** 53 けたときのことを書いたものです。 あとの (1)~(6) の問いに答えなさい。 Naoto is a high school student and lives near my house. I like him and call him Nao-san. He loves road bikes and cycling. do One day last September, I asked Nao-san to go cycling together. He smiled and said, "OK. Next Saturday, I'm going to go to the lake on the road bike 5 mountain by bike. It's a very beautiful place. Have you ever (be) there before?" "No," I answered. "Then you should go with me. Do you wwolf, the you biaya ush.caufis ou I bas zbramvinkamue ain't have a road bike?" "No, Nao-san. My bike isn't a road bike." He said, “I will use my father's road bike, so you can use mine. Let's enjoy cycling together." TH T Saturday came. "Hiroshi, first, we're going to go through the town. Let's go." Nao-san and I started our trip. 10 About an hour later, we went out of the town and took our first rest. I said, “Your road bike is very nice. I can ym a lenti go fast on your bike. It's not so hard.” He answered, “That's good. It was (A) to go through the town. But from now it will be (B) to go up the mountain. We should take two or three rests before getting to the lake." I said, "I'll be fine when we go up the mountain, so I won't need any rests." UGLER TTS Nao-san and I started to go up the mountain. Cycling with him) started to become harder. I really wanted to 15 rest, but I couldn't say it to Nao-san, so we didn't stop. About two hours later, we could see the lake at last. He said, "We'll get to the lake soon." Suddenly, my legs couldn't move because I became so tired, and I fell over. at last. He "Are you OK?" Nao-san asked. "Yes, but I made a big scratch on your road bike. I'm sorry, Nao-san.” “Don't worry about it." Then, we took a long rest. After that, we walked to the lake with our bikes. suddenly clear blue sky 青く澄んだ空 When Nao-san and I came to the lake, I was very tired and couldn't say anything. He 2 (begin) to talk. "You 20 did very well." "No, I didn't." "Listen to me, Hiroshi. When we start something, sometimes we can't do it well at first. Then what should we do?" I didn't say anything. I was just looking at his road bike. There were many old scratches around the big new one. They were not all made at one time. "I understand!" The scratches taught me the answer. "Try it many times. Then we can do it well!" "That's right," Nao-san said with a smile. "Can I go cycling with you again?" I asked. "Sure. Let's go back home now." We started to go back home under the clear blue sky. Elake きゅうけい rest 休憩、休憩する at last ついに,ようやく fell over: fall over (転ぶ) の過去形 scratch leg (s) [静岡]

解決済み 回答数: 2
英語 中学生

なぜ、答えが 『エ』ではなく 『ウ』になるのか 教えてほしいです🙇‍♀️

次の英文を読んで、問1~問5に答えなさい。 *印のついている語句には,本文のあとに〔注〕があります。(10分) A 1901, the Nobel Prize has *honored men and women from all over the world for great work in science, writing, and peace. The Nobel Prize is an *award that was started in Sweden. The name Nobel Prize comes from a Swedish scientist, Alfred Nobel, who made more than 350 *inventions. In 1895, a year betore he died. he set up the award. Many people think the Nobel Prize is the greatest award a person can receive. Twenty two people from Japan have received the Nobel Prize. Recently, awards were given to three scientists from Japan in 2014 (for their work in science. These three scientists, Isamu Akasaki, Hiroshi Amano, and Shuji Nakamura, made a bright blue *LED in the 1990s. All three colors are needed to make a white LED. White LEDs are bright, last for a long time, and don't use much *energy. Because of this, white LEDs are becoming more and more popular. They are B than fluorescent lights or *incandescent lights, but people can use them for a longer time. People can use LEDs for about 100,000 hours. That is 10 times as long as people can use fluorescent lights and 100 times as long as people can use incandescent lights. (2 Perhaps you are thinking that these scientists are cleverer than you. Their invention is really special, but they are people just like you. (3) People said that they could not do it. They had to make their own *equipment for their work. they tried more than a thousand times, they still were not able to make a blue LED. But they never gave up and finally they did it. Perhaps one day, if you work hard, you will get the Nobel Prize, too. Nobel Prize ノーベル賞 award LED I'I ・発光ダイオード 蛍光灯 機器 ……………. fluorescent equipment 〜をたたえる 発明品 honor invention energy I: incandescent 白熱灯 .…....

解決済み 回答数: 2