Grade

Subject

Type of questions

Mathematics Senior High

どこか問題点はありますか? あった場合どこがダメで、何割くらい点数貰えますか?

136 重要 例題 83 2次関数の係数決定 [最大値・最小値] (2) 00000 定義域を 0≦x≦3 とする関数f(x)=ax2-2ax+bの最大値が9, 最小値が10 とき,定数α bの値を求めよ。 基本82 指針 この問題では, x2の係数に文字が含まれているから, αのとる値によって, グラフの形が 変わってくる。 よって,次の3つの場合分けを考える。 a=0 (直線), a> (下に凸の放物線 ), a<0 (上に凸の放物線) a=0のときは, p.128 例題 77と同様にして, 最大値・最小値をa, bの式で表し, 9,=1 から得られる連立方程式を解く。 なお、場合に分けて得られた値が、 場合分けの条件を満たすかどうかの確認を忘れないよ うにしよう。 ARGIDEY TRA 解答 関数の式を変形して f(x)=a(x-1)^-a+b [1] α = 0 のとき f(x)=b (一定) となり、 条件を満たさない。 [2] a>0のとき f(x)のグラフは下に凸の放物線と なり, 0≦x≦3の範囲でf(x) は x=3で最大値 f (3)=3a+b, x=1で最小値f(1)=-a+b をとる。 したがって 3a+b=9, -a+b=1 これを解いて a=2, b=3 mn [3] これはα> 0 を満たす。 き f(x)のグラフは上に凸の放物線と なり, 0≦x≦3の範囲でf(x) は x=1で最大値f(1) = -a+b, x=3で最小値f (3)=3a+b をとる。 したがって a+b=9, 3a+b=1 これを解いて a=-2, b=7 これはα<0 を満たす。 以上から [a>0] GF 最小 || x=0 x=1 x=3 [a<0] 軸 近 最大 α = 2, b=3 または α=-2, 6=7 最大 最小 x=0 x=1 x 3 まず, 基本形に直す。 常に一定の値をとるから, 最大値 9, 最小値1をとる ことはない。 <軸は直線x=1で区間 0≦x≦3内にあるから, a>0のとき 軸から遠い端 (x3) で最 大, 頂点 (x=1) で最小と なる。 この確認を忘れずに。 軸は直線x=1で区間 0≦x≦3内にあるから, a<0のとき 頂点 (x=1) で最大, 軸から遠い端 (x3) で最 小となる。 この確認を忘れずに。 注意 問題文が “2次関数" f(x)=ax2+bx+cならばαキ0は仮定されていると考えるが, “関数” f(x)=ax²+bx+c とあるときは,α=0のときも考察しなければならない。

Resolved Answers: 1
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.

Waiting for Answers Answers: 0