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数学 高校生

数1二次関数の問題です。 LEGENDのp112の例題です。 なぜ軸がx=1なのか分かりません。 お願いします🙇‍♀️

164 関数 f (x) = ax'+2ax+b の 1Sxs3 における最大値が 10, 最小値が一 列題64 最大·最小からの係数決定 開数 f(x) = arー2ax+6 の -1三 xS2 における最大値が が1となるとき,定数a, bの値を求めよ。 例題62 @Action 2次関数の最大 最小は, グラフをかいて考えよ 場合に分ける y=f(x) のグラフを考えたいが a=0 のとき… 放物線ではない。 y=f(x) ra>0のとき…下に凸 上に凸 taキ0 のとき…放物線<a<0 のとき… 上に凸か? 下に凸か? Action》最大·最小からの係数の決定は, グラフの向きに注意せよ 解(ア) a=0 のとき f(x) = 6 となり, 最大値 5, 最小値1となることはない から,不適。 (イ)a>0 のとき @Action 例題56 「最高次の係数が文字の ときは, 0かどうかで場 合分けせよ」 62 4軸 x= 1, 頂点 (1, -a+b)の放物線で ある。 4定義域は -1いxs2 であるから,軸から遠い 方の端点 x=-1のとき 最大となる。 f(x) = a(x-1)?ーa+b y= f(x) のグラフは下に凸の放物 線であるから,f(x) はx=-1 で 最大,x=1 で最小となる。 f(-1) = 3a+6=5 f(1) = -a+b=1 --3a+b 6 よって ーa+b ゆえに a=1, b=2 10 2 これは a>0 を満たすから適する。 1回場合分けの条件a>0 を満たすかどうか確認す る。 (ウ) a<0 のとき y=f(x) のグラフは上に凸の放物 線であるから,f(x) はx31で最大, x=-1 で最小となる。 f(1) = -a+b=5 f(-1) = 3a+b=1 -a+b b 軸から遠い方の端点 *=-1 のとき最小とな る。 よって --13a+6 -101 ゆえに a= -1, b =4 これは a<0 を満たすから適する。 (ア)~(ウ)より, a, bの値は 2 日場合分けの条件 αくり を満たすかどうか確認す る。 a=1 Ja= -1 16=4 16=2, 練 となるとき, 定数a, bの値を求めよ。

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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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