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数学 高校生

黄色くしたところがよく分かりません。 教えてください🙏🏼💦

(2)これらを円形に並べる方法は何通りあるか。 ガラスでできた玉で,赤色のものが6個, 黒色のものが2個, 透明なものが1 個ある。玉には,中心を通って穴が開いているとする。 同じものを含む円順列 じゅず順順列 要例題 33 OOODO 基本 18, 重要22 CHART &UHINKING 田形に並べるときは, 1つのものを固定の考え方が有効。 固定した玉以外の並び方を 老えるとき,どの玉を固定するのがよいだろうか? (3)「首輪を作る」 とあるから, 直ちに じゅず順列=円順列:2 でよいだろうか? すべて異なるもの なら、じゅず順列で解決するが, ここで は、同じものを含むからうまくいかない。 その理由を右の図をもとに考えてみよう。 左右対称 一裏返すと同じ- 解答 (1) 1列に並べる方法は 9! 6!2! 9·8·7 -=252 (通り) 合同じものを含む順列。 2-1 (2) 透明な玉1個を固定して,残り8個を並べると考えて 8! 対の 6!2! 8·7 =28(通り) 合赤玉6個,黒玉2個を1 列に並べる場合の数。 2.1 (3)(2)の28 通りのうち, 図 [1]のように 左右対称になるものは inf(2) について, 解答編 p.213 にすべてのパターン 4通り の図を掲載した。左右対称 よって,図[2]のように左右対称でない 円順列は 28-4=24(通り) この24通りの1つ1つに対して, 裏 返すと一致するものが他に必ず1っ ずつあるから,首輪の作り方は でないものは,裏返すと一 致するものがペアで現れる ことを確認できるので参照 してほしい。 24 2 19 8さ人は。 さ人 4+ -=16 (通り) O o

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数学 高校生

英語の長文ってどうやったら読めるようになりますか

1 次の英文を読んで、問 (1) ~ (5) に且本語で答えなさい。 Lobola is the African custom of paying fora bride. Although it is an old custom, not In fact, it is being debated in Botswana. everyone in African cultures is happy with it. Many people, including many women, support payment of lobola. They explain that in Tswana culture, a marriage means joining a family, not just marrying an individual. The idea of marrying into a family is very African. just the man.Through marriage, the young woman's family loses their daughter as she then becomes a part of her husband's family. Lobola is a way to show thanks. It is a form of generosity in African culture. In its traditional form, they also explain, the groom's family gave cattle to the bride's family. But it didn't matter whether the family owned cattle or not. A woman does not get married to A man only had to pay what he could afford if he had no cattle, he could give something else, even the smallest form of payment. The tradition of lobola was a matter of pride. Today, lobola is often given in cash. purchase of a bride. Lobola is meant to join two families together. They know that But its supporters say it is not about the some people abuse the custom. But they believe that the tradition should not be tossed out because it has many positive effects. Rather than get rid of it, many believe it should just be explained better. However, many others say this custom should be stopped. They think it has become commercialized. Families make lots of demands on the groom. They think this makes lobola look very bad. They argue that in Africa's past, a girl was an asset at home. and other household chores. She did the cooking When a family lost that child through marriage, it demanded payment. Today, they think that lobola has changed into a useless tradition. In this custom, a man is buying the right to control a woman. They say women are individuals with rights. In today's world, parents do not have to be paid for a bride because their male and female children are equal. They all work and make contributions to the household. They believe that paying lobola makes it seem like a man is buying a pair of shoes or a bicycle, instead of getting married. They also argue that it is often a financial burden for couples. It is too difficult for many people to pay the price asked. So, is lobola a rich tradition, bringing families together? Or is it an ugly custom of buying women? This debate continues in Botswana, as does the custom.

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