①の主語が作者になるのはなんでですか？

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線を引いてるところなのですが なぜそのように変形？したのかが分かりません。 習ってないのに宿題で出されてしまって...教えてください

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この問題が入試であった場合、どう対策をとったらいいですか？？

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オ がわからないです🙇‍♀️ 右は解答です

135。 数列 (o。} の初項から第a項までの和 S。 を S。ニーz(mー1Rn 71)(mニ1.2.3、 とする。 この数列の初項は ーー であり一般項 gaは ーーコッ4ー >99] である。また。S。 の季大地は パーである。(S 5) っう< ーWネ の科(Ia 3 NG

オ がわからないです🙇‍♀️ 右の写真は答えです

135、 数列 (co) の初項から第み項までの和 S。を S とする。 この数列の初項は 。ニs』ニーァ[ラれ geニーバレクコカッ nm一18n和7 (mー1、 2.3、… であり, 一般項 g。 は である。また。 5S。 の最大値は しである。(S県xS5 ン、 ここLOいら(SS 0 7が ムー

答えをお願い致します

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①と②の違いを教えてください🙇⋱♀️

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(7)(8)が分からないので教えていただきたいです🙇🏻

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I kept on practicing to drive faster,but I was too afraid to floor the gas pedal. の英文の文の要素を教えてほしいです。 よろしくお願いします🙇‍♀️

これって、何故1がいけないのか教えてください。

[国 のBmらでを下記の設に符えよ>(選上 2 Notice to Parents of Sunnydale High School Stndents We wonld tike to inform you or the latest changes to Sunnydale High Schoole mobile phone pohicy for students As yo are Hikely ware。 in reeent monthey there has been a dramatic increese in he number of incidents involving mobTe phone use on school grounds during the ocial school hourm between 9 am and 3 pm. The number of students found texting cr playing games during class has increased by 35% this semester。Additiopally, teachers are reporting a shocking 20% jnmp in he number of students caught cheating by using their phones during exams and quizzes。 1n my opinion。 the most extreme olenee is that a number of students have ecretly taken videos of their teachers or other stndents in the Glassroom。 The public access to these videos then opens up their subjects to hurtful comrments and bullying, which can obyiously canse serious emotional harm to students. Therefore。 we are imposing the following rule changes in the hopes that we can mprove the sitnation: 1) Stndents are allowed to bring their mobile phones to school but they mst be kept in their lockers in the outside corridor doring class. They may use their hones dring offdal break periods, in the case cf an emergency。or they need 1o contact their parentsy in which case they need to get special permission fom a teacher. 2 Fa gudent is found using their phone in he Gasaroom。 the phone wil be went