Grade

Type of questions

English Senior High

写真の黄色い線の部分の文構造を教えていただきたいです🙇 また、 ①ifは「ーかどうか」で訳していいのか ②thisは何を指しているか ③itは何を指しているか も教えていただきたいです。 よろしくお願いします💦

Phil Hello. This is 6 Minute English from BBC Learning English. I'm Phil. Beth And I'm Beth. Phil So, Beth, we're talking about the best education systems in the world today. You went to school here in Britain. What do you think of the British education system? Do you think it could be the best? Beth I think that it's quite good, there's probably a couple of things that I personally would change about it, but I would say it's quite good, but maybe not the best in the world. Phil Well, in this programme, we're going to be talking about the Pisa rankings. Beth The rankings are based on tests carried out by the OECD, that's an international organisation, every three years. The tests attempt to show which countries are the most effective at teaching maths, science and reading. But is that really possible to measure? Well, here is former BBC education correspondent Sean Coughlan talking to BBC World Service programme 'The Global Story'. Sean Coughlan When they were introduced first of all, that was a very contentious idea, because people said 'how can you possibly compare big countries... how can you compare America to Luxembourg or to, you know, or to parts of China, or whatever?' Phil Sean said that the tests were contentious. If something is contentious, then it is something that people might argue about it's controversial. So, at first, Pisa tests were contentious because not everyone believed it was fair to compare very different countries. Beth Phil, I've got a question for you about them. So, in 2022, Singapore was top of the reading rankings. But which of these countries came second? Was it: a) The USA? b) Ireland? or, c) The UK? Phil I think it might be b) Ireland. Beth OK. Well, we will find out if that's correct at the end of the programme. A common pattern in the Pisa rankings is that the most successful countries tend to be smaller. Talking to BBC World Service programme 'The Global Story', Sean Coughlan tells us that many large countries from Western Europe don't score that highly in the rankings. Sean Coughlan They're being outpaced and outperformed by these fast, upcoming countries - you know, Singapore, or Estonia, or Taiwan, or those sort of places which we don't historically think of as being economic rivals, but I suppose the argument for Pisa tests is, if you want to have a knowledge economy, an economy based on skills, this is how you measure it. Phil We heard that many large European countries are being outpaced by smaller nations. If someone outpaces you, they are going faster than you - at a higher pace.

Unresolved Answers: 0
Mathematics Senior High

数Cの複素数平面の問題です。(1)では場合分けをしなかったのに(2)では場合分けをする理由が分からないので教えて欲しいです。

515 重要 例 96 複素数の極形式 (2) ****** 偏角の範囲を考える ①①①①① 次の複素数を極形式で表せ。 ただし, 偏角0 は 002 とする。 (1) 指針 cosa+isina (0<α<z) (2) sina+icosa (0≦x<2π) 基本 95 既に極形式で表されているように見えるが, (cos+isin●) の形ではないから極形 式ではない。 式の形に応じて 三角関数の公式を利用し, 極形式の形にする。 (1)実部の符号 - を + にする必要があるから, cos (π-0)=-cos0 を利用。 更に 虚部の偏角を実部の偏角に合わせるために, sin (π-0)=sin0 を利用する。 (2)実部の sin を cos に, 虚部の Cos を sin にする必要があるから, COS (一)=sine, sin(10) 0 =cose を利用する。 また、本問では偏角 0 の範囲に指定があり, 002 を満たさなければならないこと に注意。特に(2)では,αの値によって場合分けが必要となる。 3章 138 複素数の極形式と乗法、除法 CHART 極形式 (cos+isin) の形 三角関数の公式を利用 (1) 絶対値は 解答 また cos(b)=-coso sin(π-0)=sin O √(-cosa)+(sina)=1 -cosa+isina=cos(π-a)+isin (π-α) SI...... 1 <<πより,<<πであるから,①は求める極偏角の条件を満たすかど 形式である。 (2)絶対値は また ここで TC √(sina)²+(cosα)²=1 (+1-31 32 sinaticosa=cos(a)+isin(カーム) 0≦a≦のとき,nus であるから、求め る極形式は sinaticosa=cos π <α <2のとき 2 うか確認する。 cos(1-0)=sino sin(-)-cos 0 D 2 10≦x<2πから -as. ゆえに、αの値の範囲に (-a)+isin(-a)+ 180 よって場合分け。 5-2 232 V <<2のとき、偏 TC -a<0 2 π (各辺に2を加えると, --α<2であり 2 cos(-a)-cos(-a). 5 0 2 COS 2 sin(-)-sin(27) 10)805) 2sin(+2nx)=sin◆ 角が0以上 2 未満の範 囲に含まれていないから、 偏角に2を加えて調整 する。 なお cos( +2nx)=cos よって、 求める極形式は sina+icos a=cos(-a)+isin(-a) [n は整数 ] so 次の複素数を極形式で表せ。ただし、偏角0は002とする。求めよ。

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