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英語 高校生

この文章について、下から2番目の「one thong is clear now」のone thingが示す内容は何なのですか?

New Media There have been many great inventions in history, for example, the wheel, paper, and the steam engine. Inventions can change people's lives. They can create new businesses and new culture. This is especially true for two recent inventions personal computers and the Internet. The Internet has become an important kind of media, an important means of communication for many people. This new media form is different from older forms, such as print media (books, newspapers, and magazines) and broadcast media (radio and television) in at least two ways. LF-4 First, people can get and send information easily on the Internet. They can access information at almost any time. People can use the Internet to communicate in many ways. It's easy to send pictures, videos, and messages, so people are sending and viewing a lot of them. However, this may also be a problem. People are spending too much time on their smartphones and computers. 3» A second difference is content. With other media, such as newspapers, magazines, TV, and radio, the content is usually made by a limited number of professionals. However, nowadays, almost anyone can create and upload content to the Internet. That means we can get much more information, but we have to be careful. We don't always know who made the content, and some of the LF-3 information may be incomplete or incorrect. 4" The Internet has become an important way to get and share information. We won't know the real effect of the differences between the Internet and other media for years. However, one thing is clear now. It has already become an essential part of our culture. 1» 2»

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数学 高校生

EX76の問題を標問135の研究と同じ解き方で、3x+2y=6nを両辺6で割ってx/2+y/3=nになってx=2k、x=2k-1で場合分けして解くことはできますか。

無問 135 格子点の個数 I, y, z を整数とするとき, ry平面上の点(x,y) を2次元格子点, TYz 空 間内の点(x,y,z) を3次元格子点という.m,nを0以上の整数とすると き,次の問いに答えよ. (1) 2012/21/ysm をみたす 2次元格子点(x,y) の総数 + を求めよ. (2) x0,y0,z≧0かつ 1/3+1/13y+zan をみたす 3次元格子点 (x,y,z) の総数を求めよ. (名古屋市立大 ) ・精講 (1) 格子点をどう数えるかが問題で す。研究でx=(一定) となる直 線上の格子点を順次数えてみましたが, 大変です. そこで合同な三角形を付け足して長方形にしてみ たらどうでしょう. (2) z=(一定)となる平面による切り口を考え ると (1) が利用できます。 〈解答 (1) 0(0,0),A(3m, 0), B(3m, 5m),C(0, 5m) とおくと, 与えられた領域は △OACの周および内部である. △OAC≡△BCA であり,線分 AC 上には (0, 5m), (3, 5(m−1)), (6, 5(m-2)), ···, (3m, 0) のm+1個の格子点がある. =1/12 (15) 1 (2) ²/3x+//y+z<n & {√x+} {y≤n-z 求める2次元格子点の総数Sは, 長方形 OABC の周および 内部にある2次元格子点の総数を T, 対角線AC上の2次元格 子点の総数をLとおくと 0 S=1/12(T_L)+L=1/12(3m+1)(5m+1)-(m+1)}+(m+1) -(15m²+9m+2) 解法のプロセス (1) 三角形内の格子点の総数 ↓ 長方形を考える (2) z=(一定) 平面による切 り口を考える と変形する. z(z=n,n-1, n-2, ..., 0) を固定し, 303 3n x n y+ 5mm 0 -n-m B 3m HA IC 5n 第8章

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