Grade

Type of questions

English Junior High

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]

Resolved Answers: 2
Mathematics Senior High

[2]なぜ、qは偶数なんですか?

188 重要 例題 113 素数の性質の利用 (1) n²-12n+27 の値が素数となるような自然数n をすべて求めよ。 (2) a,bを, a < b を満たす自然数とするとき、a+b=p,ab = g を満たす ⓒp. 174 基本事項 3 素数p, g を求めよ。 CHART & SOLUTION 積が素数となる条件 ① 素数』の正の約数は1とかのみ (1)a,bを整数, pを素数とするとき 0<a<bab=pならば α=1,b=p(小さい方が1) a<b<0, ab=pならばa=-p, b=-1 (大きい方が-1) n-12n+27=(n-3)(n-9) が素数のときは,n-3とn-9がともに正の場合と,とも に負の場合がある。 解答 (1) N=n²-12 n +27 とすると (2) 積が素数(ab=g) の条件とa<bから,aとbが決まる。 また, 偶数の素数は2だけ であることを利用する。 , g の偶奇に注目。 N=(n-3)(n-9) [1] n-3>n-9> 0 すなわち n >9のとき Nが素数となるとき n-9=1 よって n=10 このとき, n-3=7から N=7 となり,適する。 [2] n-9<n-3 <0 すなわち 1≦n <3 のとき Nが素数となるとき n-3=-1 よって n=2 このとき, n-9= -7 から N=7 となり、適する。 [1], [2] から 求める n の値は n=2, 10 (2) ab=g と α<bから a=1,b=g a+b=p に代入して p=g+1 A でありとの偶奇は異なるから p=2+1=3 よって p=3 は素数であるから,条件を満たす。 したがって、求める素数 p q は 00000 PRACTICE 1120 ② 偶数の素数は2だけ g=2 p=3, q=2 まず N を因数分解。 n-3, n-9がともに 正の数なら小さい方が1, ともに負の数なら大き い方が-1 7 は素数 nは自然数だから n ≧1 1≦n<3を満たす。 ■ 7 は素数。 ◆素数αの正の約数は 1 とgのみ p-g=1 (奇数) である から,pgの一方は奇 数で,もう一方は偶数。

Resolved Answers: 1
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