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英語 高校生

【至急】この文章の題名として最も適切なものは何かという問いです。私は、②だと思ったのですが、解答は①です。 よろしくお願い致します。

次の英文を読んで、 問 1 ~ 問8に答えなさい。 (配点50点) Inspired by fierce family battles for the last remaining piece of cake, a team of three high schoolers in southwestern Japan's Oita *Prefecture have invented a device that cuts round cake and pizza evenly, no matter how many pieces are sliced, and their creation won the top prize in the prefecture's invention contest in 2021. The three students are members of the industrial technology club at Oita Prefectural Kunisaki High School. Their clever invention to solve a daily life problem with a flexible *2mindset won the governor's award in the competition and is gathering attention. Twelve students in the electronics department of the school ( 1 ) to the industrial technology club, which has continued to submit works to the invention contest for about 40 years. Five of their creations won prizes in the high school division of the 2021 edition of the competition that was launched in 1941. The top prize-winning device, whose name translates to "Let's kindly divide it up," was invented by second-year students Wataru Onoda, 16, Rinto Kimura, 17, and third-year student Mitsumi Zaizen, 18. It was inspired by bbattles for birthday cake in Onoda’s family. He needed to defeat his rival two sisters in games of rock-paper-scissors to get the last remaining piece because the cake was always cut into eight pieces despite his family having seven members. Based on Onoda's idea to equally divide a cake into seven pieces, Kimura created a drawing and computer program to precisely make parts for the device. While Zaizen could not be involved in the actual production due to preparations for her university entrance she created a video for the presentation, using her experience of winning a prize in the competition for two years in a row. exams, (2 ) a two-month trial and error process, the device was completed. When a cake or pizza is placed on a turntable made with a laser beam machine, it can be cut evenly into

未解決 回答数: 1
数学 高校生

74の(2)の答えがなぜ−nの2条+n+1になるのか教えて下さい。

漸化式 ◆ 漸化式 関係式を 漸化式という。 漸化式と初項を与えると数列の各項が定まる。 数列{an} において, たとえばan+1=2an+3のように, 前の項から次の項を決めるための ◆漸化式と一般項 初項をaとする。 1 an+1=an+d 2 an+1=ran 3an+1=an+f(n) -> 公差dの等差数列 an=a+(n-1)d 公比rの等比数列 an = arn-1 階差数列の第n項がf(n) n-1 n≧2のとき 4 an+1= pan+q (p=0, p≠1) → 以下の漸化式は, n=1, 2,3,.. an=a+ f(k) k=1 an+1-c=p(an-c) の形に変形できる。 (cはc=pc+α を満たす数) (すべての自然数) で成り立つものとする。 TRIAL A 72 次の条件によって定められる数列{an}の第2項から第5項を求めよ。 () →p.35 *(3) α=1,(n+1=-2ax+1 *(5) α1=0, 2an+1−3an=1 (1) α=1, an+1=4an+1 273 次の条件によって定められる数列{an}の一般項を求めよ。 →教 (1) a1=0, an+1=an+5 (2) a1=2, an+1=-3an *(2) α=-1, an+1=an+2n 74 次の条件によって定められる数列{an}の一般項を求めよ。 →圏p.36 例題 11 *(1) a1=1, an+1-An=4" (2) α=1, an+1-an=-2n *(3) α1=1, an+1=an+3n-1 (4) α1=2, an+1=an+5" 275 次の漸化式を an+1 -c = p (an-c) の形に変形せよ。 (1) αn+1=3an-6 (3) an+1=9-2an (2) 3an+1+an=8 (4) an+1-4an=1 176 次の条件によって定められる数列{an}の一般項を求めよ。 → p.38 例題 12 LOSEST (2) α=1, an+1= (1) a₁=2, an+1=3αn−2 an 3 →p.37 +2 列 *(4) α=1,2an+1=an+2=0 (6) a₁=5, an+1=3an-4 #MOOD 198

未解決 回答数: 1