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Mathematics Senior High

高校数学Aです 大問45の(2)、解説を見ると、式が 7P2✖️6!✖️2 となっているんですがなぜ✖️2するのですか?

45 equations という単語の文字をすべて使って順列を作るとき, 次の問いに 答えよ。 (1) 少なくとも一端に子音の文字がくるものは何通りあるか。 (2)eとaの間に文字が2つあるものは何通りあるか。 るから -7・6・5・4・3・2・1 (通り) 2,3,4の4通りの数字を 順列であるから それぞれ3通りある。 り) まとめにする。 生徒5人 方は6通り 人の並び方は 3! 通り -2.1×3.2.1 り) は 5P2通り び方は 6! 通り 3・2・1=14400 (通り) 45 (1)母音は5文字, 子音は4文字ある。 9 文字全部の順列は 9! 通り 両端に母音の文字を並べる方法は 5P2通りで, そのおのおのに対して, 残り 7文字の順列は 7! 通りあるから, 両端に母音の文字がくる順列 は5P2×7! 通り よって, 少なくとも一端に子音の文字がくる順 列は 9!-5P2×7!=9!-20-7! =7!(9.8-20) =5040.52 =262080 (通り) (2) まず, e○○の○○に2文字を並べる方法は 7P2通り そのおのおのに対して, e○○a をひとかたまり とみて、これと残りの5文字を並べる方法は 6! 通り a○○e の場合も同様に考えることができる。 よって, e との間に文字が2つある順列は 7Px6!×2=42x720x2 = 60480 (通り) 数学A A・B・C問題 の

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Mathematics Senior High

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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