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数学 高校生

基本問題の例題(2)がしょうなりいじょう7になってるけど practice33の(2)は<21になってるんですけどどういう意味で違うんですか?教えて欲しいです。

PR ③33 (1) 不等式x+1/18/1/2x-12/2 を満たす正の奇数xをすべて求めよ。 6 3 (2) 不等式 5(x-a)-2(x-3) を満たす最大の整数が2であるとき,定数aの値の範囲を求 めよ。 (11/03/12/12/28 x一 6 x+ 整理して -4x>-28 よって x <7 これを満たす正の奇数xは 1,35 6x+1>10x-27 (2) 5(x-a)s-2(x-3) 5 xs- ① を満たす最大の整数が2となるのは 5a+6 25 43 74 のときである。 ゆえに 14≦5a+6<21 よって CHART & THINKING 1次不等式の整数解 数直線を利用 まずは、与えられた不等式を解く。 (1) 2桁の自然数x≧10 5a +6 7 解答 (1) 6x+8(6-x) > 7 から 41 x < -=20.5 ゆえに Sa+6 3 7 ①を満たす最大の整数 xは2桁の自然数であるから 10≤x≤20 求める自然数の個数は 567X のときである。 ゆえに 1 <2a≦2 よって 12/2<as1 +86-x) を満たす2桁の自然数xの個数を求めよ。 基本 29.32 (2) 不等式 5(x-1)<2(2x+α) を満たすxのうちで, 最大の整数が6であ るとき,定数aの値の範囲を求めよ。 x の整数が6となるのはAがどのような値の範囲にあるかを 考えよう。 は x<A を満たすが,x=7 は x=6 x<A を満たさないことが条件となる。 -2x>-41 両辺に6を掛けて分母 を払う。 10 11 範囲を 10≦x≦n の形に表す。 この不等式を満たす整数の個数は? 2桁 7は含まれない。 SC ◆展開して整理。 (2) 不等式の解は x<A の形となる。 数直線上でAの値を変化させ, x <A を 20-10+1=11(個) (2) 5(x-1)<2(2x+α) から x2a +5 / ••・・・ ① ①を満たすxのうちで最大の整数が6となるのは 114 6<2a+57 2< これと不等式の解を合わせて、条件を満たす整数xの他の 20 41 2 5a +6 7 25+6 3 などとし 7 ないように等号の有無に 注意する。 -<3 とか 21 x 2a+5 7 ①を満たす最大の整数 x を満たす最大 A ◆展開して整理。 不等号の向きが変わる。 ◆解の吟味。 ◆展開して整理。 6<2a+5<7 とか 6≦2a+57 などとし ないように。 等号の有 無に注意する。 a=1 のとき, 不等式

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英語 高校生

答えないです。軽く根拠と答え教えていただきたいです。

1 ()内に入る最も適切な語句を①~④から選びなさい。 (1) As far as I know, there are ( each 2 few (2) In developing countries, there are still a lot of villages with no 1 run 3 running ran (3) I didn't like the movie. It was not as ( 1 excited 2 exciting (4) I was so ( 1 disappoint (6) The company is planning a trip ( ) studies on the history of the region. 3 little ) when I heard the news 2 disappointed 3 disappointing and grolle Halid (5) Our office will not accept responsibility for items lost or ( 1 steal 2 stealing 3 stealth to go to swimming going swim (8) My sister ( 1 likes (7) Can I borrow something 1 to write (10) The student ( 1 what ) as I had expected. 3 excite (9) The singer is very talented and is sure 1 to win 2 won juo beatio )? I don't have a pen. 2 to write for (14) One reason 1 which (11) To my surprise, Paul gave me all the books ( 1 of 2 of which ) at a beautiful beach in Okinawa. 3 going to swimming CHE 3 to write with mundo ) the singing contest. ) he had. 3 that (13) Barcelona is the city () I spent last summer. 11 those 2 where 4 much lood a hell ) water. to pass the exam, for she spent a lot of time preparing for it. 2 is liking 3 likely nulol 3 which 4 have run Bürostuler e'an enw triguor (#****** to disappoint excitement Svi no es mob amse salt sven 4 stolen J - 4 what (12) There are only a few places around this area for children to play, (x) is 1 that 2 what 3 where E 4 is likely (東京電機大) idquodi L 4 to go swimming arbonogeek(岐阜聖徳学園大) 4 to write on COPY winning 4 3 for winning MAZSPRODAT ) had a temperature has gone to the nurse's room. lir)) (f (神戸松蔭女子学院大) 2 who 3 whom 4 whose VYSTIM 4 while is really a problem. 4 which (名城大) (日本大) 東京電機大) as C ESPERIEN (松山大) Kenji likes that class is that it is directly related to his dream for the future. 2 when na we 13 where ignoolew\ iady Soa 2 下線部のうち, 誤った英語表現を含むものを1つ選びなさい。 (福岡大) (甲南大) (S) ( 愛知学院大 ) og a spelliver to teriqeorts sil フェリス女学院大) 4 why X (1) Students who choose to 2 major in one of the Liberal Arts disciplines 3 will take courses 4 designing to foster independent thinking. (東北医科薬科大) (2) 1 After serving in the military, the man went back to his native village, 2 which he lived 3 among his Dk. \ ei, childhood friends 4 until he died. her family. (京都外国語大) (2 (2 (3) (5) (6) B D

未解決 回答数: 1
英語 高校生

これといてください。至急です お願いします 英語分かるかた

2010 解答用紙を6/1(木)に提出 解説は英語でします。 【1】 次の英文を読んで、後の設問に答えよ。 (配点 50) A few years ago, a certain famous university in Japan asked a unique question as its entrance examination in English. The question was this: Write a reply in English to a junior high school student who doesn't like studying. He says he has no intention of going abroad, so he doesn't think he needs to study English. Nor does he want to get a job in which the knowledge of math or science is required. He, therefore, insists that he cannot understand the reason he is forced every day to study subjects he is not interested in. As an entrance examination, it's not very difficult to write an answer to this question. (2) you take it seriously, however, it touches on such a profound aspect of human nature that it is worth thinking about. Fundamentally, why do you have to study? What is learning for? Would you still like to study even if there were no schools or examinations in the world? In my opinion, it is possible to answer such questions from a practical and essential point of view. First, it is not rare for anyone to find changes in their own preferences or desires over time. Sometimes we find ourselves possessing no interest in what we thought to be precious before. Sometimes we are surprised to realize that what we thought to be of little value is so important. So it is quite hard, especially for young people, to predict actually what one will want in the future, say, ten years from now. That's why it is highly desirable for students to prepare for their future by increasing their knowledge and improving their intelligence. Whatever job one may get, it is quite (4) that knowledge or intelligence gets in the way. This can be demonstrated partly by many adults confessing that they should have studied harder. ( 5 ), it's only while one is young that one has a good memory and can absorb and retain a vivid impression of what one has learned. Next, I would like to talk about a more subtle viewpoint. Essentially, no human beings can be satisfied with what they already have, and everyone has, at 1921 the bottom of their heart, the desire for a better existence. Please do not interpret (67 INT this only in terms of materialism or religious belief. Of course, food, clothing. and housing are important. Still, ( 7 ). Also, in the present age, it is difficulí to feel there is anything in the belief that God will come to help you have a better existence some day. Even if all of your basic needs are met, without one important thing, you cannot feel that your life is meaningful. This one thing is the ambition to improve yourself. When you learn something you didn't know before, you will surely feel the satisfaction that no other element in life can give. In this sense, learning will enable you to broaden your world, giving you the joy of knowing. In short, learning is an important way to make your own life richer. (A) 下線 (1) (3) を和訳せよ。 (B) 空所 (2) ( 5 )に入れるのに最も適切なものを、それぞれ次のア~エ の中から1つずつ選び、 その記号を記せ。 (2) 7 Because If (5) 7 For example In conclusion Though In addition What is worse (C) 空所 (4) に入れるのに最も適切な 同じ段落の中から抜き出して、 解答欄に記入せよ。 下線部)が表す内容を、 本文に即して70字以内の日本語で説明せよ。 1931 1. Unless

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数学 高校生

(2)の区別をなくすという意味が分かりません💦どういうことか教えてください🥲🙇🏻‍♀️

重複順列 基本例題 19 00000 (1) 0, 1,2,3の4種類の数字を用いて, 3桁以下の正の整数は何個作れるか。 (2) 7人を,2つの部屋 A, B に入れる方法は何通りあるか。 また,区別をし ただし, 同じ数字を繰り返し用いてもよいものとする。 ない2つの部屋に入れる方法は何通りあるか。 ただし, それぞれの部屋に は少なくとも1人は入れるものとする。 p.279 基本事項 3 基本14 CHART & THINKING 重複順列 n (1) 数字を並べてできる整数 各桁の数字の条件に注目 最高位に 0 は使えないことに注意しよう。 3桁,2桁,1桁,それぞれの場合に分けて考えよう。 例 PART (2) 区別をなくす場合 同じものは何通りあるか考える (前半) まず,空の部屋があってもよいとして,後で空になる場合を除く。 (後半) 区別をなくすと同じ入れ方になるものは,例えば,次のような2通りずつある (=「ペア」で現れる) ことに注意しよう。 A B 1 2 3 4 5 6 7 A,Bの区別をなくすと 0 以外の 3通り と 126÷2=63(通り) 解答 10-8--8-S (1) 3桁の整数は、百の位の数字が0以外であるから 3×42=48 (個) 2桁の整数は3×4=12 (個), 1桁の整数は 3個 よって, 3桁以下の正の整数は 48+12+3=63 (個) 【別解 2 桁の整数は百の位の数字が 0 1桁の整数は百と十 の位の数字が0とすると,3桁以下の整数は 000 になる場合を除いて 43-163(個) 4個 全宗 (2) 空の部屋があってもよいものとして7人をA,Bの部屋 に入れると、その方法は 12 27=128(通り) 一方の部屋が空になる場合を除くと 128-2=126 (通り) TA 4個から重複を許し て2個取って並べる →42通り A B 5 6 7 1 2 3 4 50 4772 0 512 百の位の数字の選び方 は0以外の3通りで, 十 Ⅰ の位、一の位は4種類の 数字のどれでもよい。 例えば 012 2 桁の整数 12 003...... 1桁の整数 3 1830 (2) 異なる2個から重複を許 して7個取り出して並 べる順列の総数と同じ。 区別をなくすと, 一致す る場合がそれぞれ2通 りずつある。 287 1章 2 順 列

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