赤線部が分からないのですが、 ①Ｙ=0というのはどのようにして分かるのですか？ ②Xは実数であるからら実数を係数とするこのXの二次方程式は実数解をもつとはどういうことですか？

16 2次関数 6 最大・最小 (2) 例題 6 2変数関数の最大・最小 [11 関西 ] (1) 実数x,yが2x+y=8 を満たすとき, x+y-6x の最大値を求めよ。 [09 愛知工業大] (2) 実数x,yがx-xy+y-y-1=0 を満たすとき,の最大値と最小値を求めよ。 解法へのアプローチ (1) y を消去すると, xの2次関数の最大・最小の問題になる。 このとき, xの変域に注意する。 (2) xの2次方程式とみなすと, これは実数解をもつ。 この実数条件によってyの値の範囲が定まる。 解答 (1) 2x² + y² = 8 y² = 8−2x² ..... y は実数であるから,y≧0より 8-2x²20 したがって, (x+2)(x-2) ≧0より 2≦x≦2...・・・② z=x+y6x とおくと,①から z=x2+ (8-2x2) - 6.x 3y²-4y-4≤0 (3y+2)(y-2) ≤0 // sys2 よって, yの最大値は2,最小値は T 3 -2 ZA |17 16 =-x-6x+8 =-(x+3)^2+17 ②の範囲でグラフをかくと右の図のようになる。 したがって, zはx=2で最大値 16 をとる。 よって, x=-2, y=0 のとき, 最大値 16 (2) 与式をxで整理して x-yx+(y-y-1)=0 x は実数であるから,実数を係数とするこのxの2次方程式は実数解をもつ。 したがって, その判別式をDとすると D=(-y)^2-4(y-y-1)≧0 O 2 XC

空間ベクトルの問題なんですけど全く分からないので教えて欲しいです🙏

12 (1) 空間内に4点A(0, 0, 0), B(2, 1, 1), C(-2, 2, -4), D(1,2, -4) がある。 (1) ∠BAC=0 とおくとき, cose の値と△ABCの面積を求めなさい。 (2) AB と AC の両方に垂直なベクトルを1つ求めなさい。 (3) 点Dから, 3点 A, B, C を含む平面に垂直な直線を引き,その交点 をEとするとき,線分 DE の長さを求めなさい。 (4) 四面体 ABCD の体積を求めなさい。 (大分大)

数列の問題なんですけど全く分からないので教えて頂きたいのですが😿

② 数列 1,1,3, 1,3, 51, 3,5,71,3,5,7, 9/1, 2 7 次の問いに答えよ。 ただし,k,m,nは自然数とする。 (1) k+1回目に現れる1は第何項か。 ¥2, (2) 回目に現れる 17 は第何項か。 (3) 初項からk + 1回目の1までの項の和を求めよ。 (4) 初項から第n項までの和をSとするとき, S>1300 となる最小の n を求めよ。 (名古屋市立大 ) (4 において,

3️⃣の3番誰か教えてください。

涙 helped 3 読解 コーナー次の対話文を読んで、あとの問いに答えなさい。 Teacher: (あなたは英語に興味がありますか。) Machiko: Not really. I feel it's too difficult. I can't speak it well. Teacher: I see. Do you study English every day? →ほとんど Machiko: Yes, almost every day. Teacher: Good. How long do you study it? Machiko: About fifteen minutes, I think. Teacher: Well, that's not enough. You must study it longer. English is spoken in many countries, so it's very important. □(1) ① 内の日本文を英文にしなさい。 by my sister. whot are You interested in English? □ (2) 下線部 ② で、先生が 「よろしい。」 と言ったのはなぜですか。 日本語で答えなさい。 [マチコがほとんど毎日英語を勉強しているから。 □ (3) 下線部③の文をほぼ同じ内容を表すように書きかえるとき, に適する語を書きなさい。 in many countries,

mustは〜しなければならない、〜に違いない の2つの訳があるとおもうのですが、どのように意味の判別をするのでしょうか？

それはなければならないである must be It (5) S Vi It = money〇(先) and 耐久性がある lasting, ... CUST 容易に を持ち bonli easy (to carry a

(2)で、got、to、correctが入るらしいのですが何故なのか解説お願いします🙏

3 次の各組がほぼ同じ意味になるように、空欄に適語を書きなさい｡ (1) The head master made him do the work alone. The head master (f ) him ( )( (2) I had Professor. Hara correct my English essay. ) Professor. Hara ( )( ) the work alone. ) my English essay. I(g (3) His father finally let his son study abroad. His father (a ) his son ( )( ✓ (4) My boss always orders me to carry his luggage to the office. My boss always ( ) me ( ) abroad in the end. ) his luggage to the office.

大門5の2番合ってますか？ 教えてください🙇‍♀️

ig Point マイン・カフォンと は何ですか。 エクトコ Look at this picture. Can you imagine what the device for clearing landmines. It is made of an iron ball object is? It is Mine Kafon, a wind-powered Rolling along the ground, it and bamboo legs. 5 steps on a landmine and explodes it. Even today, there are about 110 million landmines in the world. Every 22 minutes, one person is injured or killed by Many of the victims are ordinary This device is expected to reduce the landmines. people. number of landmines in the world. Mine Kafon made of? landmines are there in the world today? Massoud Hassani, a designer, wanted to solve landmine problems with the power of design. He was born in Afghanistan in 1983. At that time, there were several wars going on there. Massoud and his family lived in an area surrounded by landmines. as a child, Massoud made all his toys Living there by hand. His favorite toys were paper-made objects that were rolled by wind power. Because his toys often landed in areas with landmines, he could not get them back. Questions AMI PERHE designe des di A マスードさ のころに ちゃを Where and when was Massoud borm 2 What did Massoud make by hand

大門2合ってるか確認して欲しいです お願いします

ig Point マイン・カフォンと は何ですか。 エクトコ Look at this picture. Can you imagine what the device for clearing landmines. It is made of an iron ball object is? It is Mine Kafon, a wind-powered Rolling along the ground, it and bamboo legs. 5 steps on a landmine and explodes it. Even today, there are about 110 million landmines in the world. Every 22 minutes, one person is injured or killed by Many of the victims are ordinary This device is expected to reduce the landmines. people. number of landmines in the world. Mine Kafon made of? landmines are there in the world today? Massoud Hassani, a designer, wanted to solve landmine problems with the power of design. He was born in Afghanistan in 1983. At that time, there were several wars going on there. Massoud and his family lived in an area surrounded by landmines. as a child, Massoud made all his toys Living there by hand. His favorite toys were paper-made objects that were rolled by wind power. Because his toys often landed in areas with landmines, he could not get them back. Questions AMI PERHE designe des di A マスードさ のころに ちゃを Where and when was Massoud borm 2 What did Massoud make by hand

なぜ、forが　an examの後ろに来るんですか？🥲

(1) 彼らは昨夜9時に、試験勉強をしていた。 (They were studying exam an last night at ) for nine × 不正解 【解答】 They were studying for an exam at nine last night.

ここの問題の答えが欲しいです教えてくださった方フォローいいねベストアンサーします！

3 次の英文を日本文にしなさい。 (1) Do you want to study music in this country? Hors: (2) The kind girl gave me something cold to drink. (ot\bso\onalood omitoved (3) All of us are glad to meet you. T SidaouiHysiq (bib \ nigod\ndw\ of Vuoch ke (4) He had no time to play with his little children last week.lq) horool namblidh badool peabildo d (5) My brother went to the post office to buy some stamps. of havol \ svil) bond TARGENT