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英語 高校生

英語の長文です どこに文法表現があるか知りたいです! よろしくお願いします。

5 UNIT3 Reading Passage 10 15 20 20 25 30 Listening When important events are happening around the world, most people turn to traditional media sources, such as CNN and BBC,¹ for their news. However, during the invasion of Iraq by the United States and its allies in early 2003, a significant number of people followed the war from the point of view of an anonymous² Iraqi citizen who called himself "Salam Pax" (salam means "peace" in Arabic, and pax means "peace" in Latin). Salam Pax wrote a diary about everyday life in Baghdad during the war, and posted it on his web site. Pax's online diary was a kind of web site known as a "blog." Blogs, short for "web-logs," are online diaries usually kept by individuals, but sometimes they are written by companies and other groups of people. They are a rapidly growing type of web site on the Internet. There are estimated to be several hundred thousand blogs on the Internet, and with the popularity of other social media sites, the number of people writing online about their lives continues to grow. may find A blog differs from a traditional web site in several ways. Most importantly, it is updated much more regularly. Many blogs are updated every day, and some are updated several times a day. Also, most blogs use special software or web sites which are specifically aimed at bloggers, so you do not need to be a computer expert to create your own blog. This means that ordinary people who computers difficult to use can easily set up and start writing their own blog. In 2003, the Internet company AOL³ introduced their own blogging service, enabling its 35 million members to quickly and easily start blogging. There are many different kinds of blogs. The most popular type is an online diary of links, where the blog writer surfs the Internet and then posts links to sites or news articles that they find interesting, with a few comments about each one. Other types are personal diaries, where the writer talks about their life and feelings. Sometimes these blogs can be very personal. There is another kind of blogging, called "moblogging," short for "mobile blogging." Mobloggers use cell phones to take photo's, which are posted instantly to the Internet. When the content and images posted online involve news subjects, mobloggers become citizen journalists. In fact, the Korean web site OhMyNews was a well known source for articles from international citizen journalists. However, in 2010, OhMyNews stopped posting new articles. Instead, it is now a blog site where citizen journalists can choose what makes the headlines, or just share ideas about how regular people are changing the news world. Anyone who visits the web site of a big media company can clearly see how the idea of blogging has changed the reporting of news. Quite often, a list of reader comments follow news articles. It seems that the news is becoming less like a report or a lecture, and more like a conversation, where anyone can join in. CNN, BBC Cable News Network, British Broadcasting Corporation anonymous not named; unknown 3 AOL America Online

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数学 高校生

(1)で2つの球面が交わる点を結んだ線は必ずcの直径となるのですか?なぜそうなるのかわからないので教えて頂きたいです。

28 よって、球面 (x-2√/3)+(y-2√ 練習 2つの球面S: (x-1)+(y-1)'+(z-1)'=7, Sz: (x-2)2+(y-3)+(z-3)=1がある。 @87 球面S, S2 の交わりの円をCとするとき,次のものを求めよ。 (1) ACの中心Pの座標と半径 (1) S. の中心をO (1,1,1), 半径をn=√7. (2) 円Cを含む平面αの方程式 S2 の中心を O2(2,3,3), 半径を n=1 とすると、中心間の距離は実 002=√(2-1)2+(3-1)+(3-1)=3 ←2つの球面の半径を Rとし,中心間の距離を dとすると √7-1 <3<√7 + 1 すなわち n-rz|<0:02<ntr2 が成り2つの球面の交わりが円 立つから、2つの球面 S1, S2 の交わりは円である。 ⇒\r−R\<d<r+R 点Pは円Cを含む平面αと直線 0.02 の交点に一 致し 円C上の点をAとすると, 半径rについて r=AP (0-6 S₁ Si OP=t とおくと O2P=0.02-01P=3-t △OPA, OPA について, 三平方の定理より 01 1-(199) P (2.3.3 JA S₂ 02 13-1 AP2=0A-0,P2=(√7)-t AP=O2A2-O2P2=12-(3-t)2 平面α -1) JA よって 7-t=-t+6t-8 5 ゆえに t= 2 JUCCUB 2 √3 よって, 円Cの半径rは r=AP= 7- = ←AP2=(√7)^ 2 2 (+) また OPPOz= 5: (3-5 2 2 =5:1であるから,中心Pの ←点Pは線分 002 を 1.1+5.2 1・1+5.3 座標は 1・1+5・3 5+1 , 5+1 , 5+1 すなわち 11 8 8 5:1 に内分する。 280 6 3 3 (2)平面の法線ベクト

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