Grade

Type of questions

Mathematics Senior High

(2)の問題で最大値がない理由を教えてください。

30 基例題 本 72 2次関数の最大値・最小値 (2) 関数 y=x2+2x-1 の定義域として次の範囲をとるとき, 各場合 について, 最大値、最小値があれば,それを求めよ。 (1) -3≦x≦0 (2) −2<x<1 CHART & GUIDE 1 まず, 平方完成して、 グラフをかく。 2 与えられた定義域に対する値域を求める。 3 値域の中で,最大値、最小値をさがす 。 最大 端の点が入っているかどうかを確かめる。 -3 注意 2次関数の最大・最小 グラフをかき、頂点と定義域の端の点に注目 -1 O 解答 にな方向から 関数 y=x2+2x-1 すなわち y=(x+1)-2のグラフは下に凸の放物線であり、 その頂点は(-1,-2), 軸は直線x=-1 である。(第一 f(x)=x2+2x-1 とおくと f(-3)=2, f(-2)=-1, f(0) = -1, f(1)=2, f(2)=1 各定義域での関数のグラフは、 下の図の実線部分のようになる。 (1) y (2) ya (3) 2 -2 x 最小 値域は -2≦y≦2 であり x=-3 で最大値 2 x=-1で最小値-2 <<< 基本例題 71 2 -2-1 V 10 1 x -1 -2 (3) 0≤x≤2 最小 値域は -2≦y<2であり 最大値はない x=-1で最小値-2 TRAINING 72② 次の関数に最大値、最小値があれば,それを求めよ。 I YA 7-- 最大 -1 12 HO 準7: -1 -2 関数 を定め 例量 CHAR & Gu X 解 最小 値域は-1≦y≦7 であり x=2で最大値7 x=0 で最小値-1 最大・最小の問題では定義域が重要! 最大値,最小値は定義域によって変わる。 単純に「頂点のところで最大か最小」 とは限らない。 ・一般に,頂点と定義域の端の点が最大・最小の候補になる。端の点が入るかどうかも チェックしよう。 慣れてきたら,かいたグラフをもとにして直ちに(値域を書くのは省略して)最大 nonton21 . 値・最小値を求めてもよい。 f

Unresolved Answers: 1
English Junior High

1部だけでも大丈夫です。答えを無くしてしまって、分からないので教えて欲しいです

40 11 次のCとDの関係が AとBの関係と同じになるように, C A B trains leaf (1) train (2) woman foot dish. (3) tomato (4) water tea (5) child (6) you (7) my (1) 次の各組の文がほぼ同じ内容になるように, (My uncle teaches English. (My uncle is (It snows a lot in February. They have a lot of Are these our tennis balls? Are these tennis balls Those flowers are very beautiful. (2) (3) women tomatoes a glass of water two children (5) your mine English no Japanese it her に適する語を書きなさい。 D に適する語を書きなさい。 in February. very beautiful flowers. There wasn't anyone in the classroom after school. There in the classroom after school. (3) Whose watch is this? (下線部を複数形にかえて) → Whose (4) His sister saw someone in the garden. (XIC) に適する英語を書きなさい。 3 次の文を 内の指示にしたがって書きかえるとき (1) There were some oranges in the refrigerator. (下線部を単数形にかえて) →There (2) Kenji brought the big table here himself. (下線部を Kenji and I にかえて ) the big table here 次の対話文がなりたつように, に適する語を書きなさい。 (1) A: There are four seasons in a year. How many B: There are twelve. (2) A: What are doing? B: We're carrying this big box to the gym. (3) A: Are those children your brothers? B: Yes, are. I must take a two of tea in the refrigerator. is very heavy. to the park. are there in a year? in the garden? [5] (1 (2 (3 (4

Unresolved Answers: 2
English Senior High

答えがなく困っています。 どうかよろしくお願いします。

Ⅰ 次の英単語で最も強く発音する部分(第一アクセント)を、 それぞれ記号で答えなさい。 d 2. a-bil-i-ty 3. access 4. va-ri-e-ty 5. in-tro-duce del-i-cate アイウ アイウェ アイ アイウェ アイウ Ⅱ 次の英文を読み、 設問に答えなさい。 How many hours a day do you spend on your *cell phone? Today, more and more young people are spending more and more time on smartphones and computers. According () a 2013 *survey carried out by the *Japanese Cabinet Office, 97.2% of high school students owned a cell phone; of these, 82.8% had a smartphone. This is a *drastic increase from 2010, when only 3.9% of those with cell phones had smartphones. The survey also shows that the spread of smartphones has led to increased access to the Internet among children, whose average access time on a weekday is 107 minutes. The Cabinet Office also found that 40% of Japanese children *log on to the Internet more than two hours a day, and that 8% spend more than five hours a day online. This has led to some serious social and *psychological problems. Heavy Internet users become *obsessed with staying online and develop an *addiction to games, social media sites, and free communication systems such as LINE. The various *adverse effects of such addictions have been reported in most developed countries. Many young addicts suffer (2) headaches and sleep disturbances such as *insomnia. They fail to maintain normal weight *due to eating irregularities. And many are more likely to experience emotional distress, isolation, anxiety, and depression. A British study suggests a clear link between excessive Internet use (3) lower self-esteem. Those young people who spend more than A four hours a day looking at a screen are particularly *vulnerable to mental *disorders. -No H Several related studies conducted in China make clear the effects of Internet use on brain structure. One study has shown that *volume @losses were seen in the *gray matter areas of Internet addicts' brains. These areas are involved in people's ability to develop *empathy and compassion for others. Another Chinese study used MRI scans to look at the brains of Internet-addicted teenagers and found significant damage in the *white-matter nerve fibers connecting the brain areas governing emotions, decision-making, and self-control. Similar (4) can be seen in the brains of heavy alcohol and drug users. () cell phone: ## survey: drastic: 極端な log on: アクセスする obsessed with ~ : ~に夢中になる addiction due to~: ~のため volume: white matter: insomnia: TRE disorder: , empathy: # 1. ( ) ①~④に入れるのに最も適した語をそれぞれ一つずつ選び、その記号で答えなさい。 (with into A to = at) 2 ( from = above) □in Japanese Cabinet Office: A psychological: 心理的な . # adverse effects: vulnerable to~: ~になりやすい gray matter: K ハon

Unresolved Answers: 1