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数学 高校生

この問題の④がn=1の時も成り立つとありますが、どこで成り立っているのかが分かりません!誰か解説してくださるとありがたいです、よろしくお願いいたします🙇

B1-40 (58) 第1章 数 列 Think ○見るたり多度 例題 B1.27 いろいろな数列の和 ( 2 ) Sm=1−22+32-4'++ (−1)" を求めよ. 解答) その和を分けて考える必要がある. nが偶数、つまり=2mmは自然数のとき、 wwwwwww wwwwwwwwwwwwwww Sam=1-2+3-4++ (2m-1)-(2m)2 2m III Colu nが奇数、つまり=2m+1のとき =(12−22)+(32-4°)+…+{(2m-1)-(2m)2} 第 m項 S2m+1=1-2°+32-4°++ (2m-1)-(2m)+(2m+1)2 =(12-2)+(3°-4°)+…+{(2m-1)-(2m)2}+(2m+1)2 nが偶数のとき, n=2mmは自然数) とおくと, wwwwwwwwwwwwwww. Sm=S2m=(12−22)+(3-4)+…+{(2m-1)-(2m)2} ={(k-1)-(2k)}=2(-4k+1) k=1 第 (2m+1)項 いう m 第3項 こ①初う例 n=2,4,6 数列 {(2m-1)^- 初項から第 =-4mm(m+1)+m=-m(2m+1) n=2mより,m=in を①に代入して, == S,=-1/2"(n+1) ② __(n+1) での和と考える 和はnで表す っちの方 ○かりやよい wwwwwwwwwww nが奇数のとき,n=2m+1(mは自然数) とおくと, Sw=Szm+1= (12-2) + (3-4) +...・・・ +{(2m+1)-(2m)2}+(2m+1)^ =Szm+(2m+1)=-m(2m+1)+(2m+1)2 (m+1)(2m+1) (3 n=2m+1より,m= (n-1) を③ に代入して, S.=2+1/2)(n-1+1)=1/2m(n+1)……③ ④は n=1のときも成り立つ. よって,②④より, Focus n=3,5,7, n=1 とすると 1/12=1 Sn=(-1)+12 n(n+1) 場合 この形のままでもよ nが偶数の場合と奇数の場合に分けて考える S2m+1=S2m+a2m+1 練習 一般項am=(-1)n(n+1) で定められる数列の和 B1.27 S„=a+a2+α+... + α を求めよ. ***

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英語 高校生

ここのhave leftって、使役動詞+O+過去分詞の、使役構文じゃないんですか??

Athletes think > they run out of energy because their sugar has run out, but in reality, athlete 「運動選手」 thatの省略 「実際は 」 運動選手は考える 彼らはエネルギーを使い果たしたとなぜなら彼らの糖分を使い果たしたから しかし実際は they have plenty of “fat energy" left 「たくさんの〜」 /but no way to draw from it. ^ they have の省略 (不定詞の形容詞的用法) 彼らはたくさんの「脂肪のエネルギー」 を残している 〈文構造 > しかしそこから(エネルギーを) 取り出す方法がない (S1) Athletes (V1)t think (O) ((that) (S' they (v') run out of energy <because (S') their sugar (y) has run out〉), 運動選手は (〈糖がなくなったので〉 エネルギーを使い果たした) と考える but in reality, (S2)they (V2) have (O2) plenty of "fat energy" (C2) left but (they have) (03) no way [--] . 不定詞 [to draw from it] しかし実際には、多量の 「脂肪のエネルギー」 が残っているが、 [それを取り出す] 方法がないのである。 have plenty of "fat energy" left は have A done 「Aを〜の状態で持つ」の形。 「たくさんの 『脂肪のエネルギー』 る」などと訳す。 to draw from it は形容詞的用法の不定詞で way を修飾している。 「そこから取り出すための方法」

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英語 高校生

黄色い線部分の意味がわかりません。

第2問 (配点 10) Your school is arranging a work experience programme for students in Years 10 and 11. As a member of the student council, you want to present 11/ some ideas to the school to make the programme a success. You have found a report written by the school council at a school in the UK which looks helpful. Work Experience Week Last month Work Experience Week was held at our school. A11 400 students in Years 10 and 11 were asked to participate. The school provided a list of companies that were willing to accept students for a week, and students were also given the chance to contact companies by themselves. Nevertheless, some of them failed to find a place to work. Students who were not successful in finding a company had to come to school for self- study, so we should find a better way to match up students and companies next year. According to the school, 6% of Year 10 students and 34% of Year 11 students didn't participate. Why was there such a difference? The comments below clearly show the reason for this. Feedback from participants Harry, I really enjoyed the work experience. I found my company from the school's list, so it was easy to set it up. Yu-ming: This was my second time, I'm happy I did it, but most kids in my year just wanted to study for their exams. Maybe it should just be for Year 10. Clara: I couldn't get my first choice, so the workplace was a bit too far. But I think the experience helped me to try harder. Mo: I arranged my own this year. The ones on the list are fine, but several students go to the same place. I wanted to be the only student, and this time I was. Ryan: I already know what I want to be (a physical therapist) and this 2, 3 LIKE 3 To

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