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数学 高校生

数Aの整数問題です。ここの部分が何を言っているのかよく分からないので教えてください🙇🏻‍♀️💦

584 8章 数学と人間の活動 18- 整数の分類 整数を文字で表すと, 整数のしくみがわかって、 今まで使っていた数の知らない一面が見 られることがあるよ。 数学の面白さの1つだね。 6 3の倍数は3k(kは整数) とおけばいい。 “何かの数の3倍” ということだか らね。 0% 「3の倍数“でない” 整数は、どうおけばいいのですか?」 3の倍数より2大きい整数は 3k+2 (kは整数) 3の倍数より大きい整数は3k+1 (kは整数) とおけばいいね。 また,3の倍数より2大きい整数は“3の倍数より1小さい整数”ともいえ るので3k-1 (kは整数) さらに,3の倍数より大きい整数は,“3の倍数より2小さい整数”ともい えるので3k-2 (kは整数) とおいてもいい。 ちなみに, kが自然数のときは, 3k, 3k-13k-2とお かなきゃいけないよ。 「2-7と同じ理屈ですね。」 その通り。 3k,3k+1, 3k+2 (kは自然数) とおいてしまったら, k=1, 2, 3, ・・と代入していくと 3kは, 3, 6, 9, 3k+1は, 4,7, 10, .... 3k+2は, 5,8, 11, となって,1や2がどこにも入っていないことになるから変なんだ。 「いつも3k,3k-1, 3k-2とすればいいわけか。」 ru 4 そうい 例題8_ そ

解決済み 回答数: 2
英語 中学生

3枚目の写真のような問題って どうやって解くんですか? 私はいつも段落の最初と最後を見てるんですが 一問間違えてしまいました。ぼぼ勘だったりもするので教えて欲しいです🙇‍♀️

いる。 各問いに答えよ。なお, [1] Have you ever seen the 2D codes which have a special mark on the corners? For example, you can find the 2D codes in your textbooks. When you scan them with a tablet computer, you can see pictures or watch videos. Today, a A lot of people around the world use them in many different ways. This type of (2 2D code was invented by engineers at a car parts maker in Japan. [2] When cars are produced, many kinds of parts are needed. Car parts makers have to manage all of the car parts. About 30 years ago, car companies needed to produce more kinds of cars, and car parts makers had to manage many different kinds of car parts for each car. At that time, they used barcodes to manage the car parts, but they could not put a lot of information in one barcode. So, they used many barcodes. Workers had to scan many barcodes. A worker at a car parts maker had to scan barcodes about 1,000 times a day. It took a lot of time to scan them. The 0 000742 221101 barcode (バーコード) workers needed some help to improve their situation. [3] The engineers at a car parts maker in Japan knew the situation of the workers. They started to learn about 2D codes because 2D codes can contain more information than barcodes. There were already some types of 2D codes in the U.S. One type could contain a lot of information, but it took a lot of time to scan that type. Another type was scanned very quickly, but it contained less information than other types. The engineers at the car parts maker did not use these types. They decided to create a new type of 2D code which had both of those good points. The engineers needed a long time to create this new type which could be scanned quickly. Finally, they thought of an idea. They thought, "If a 2D code has a special mark on the three corners, it can be scanned very quickly from every angle." In this way, the new type of 2D code with special marks was invented by the engineers at a car parts maker in Japan. 2D code

未解決 回答数: 1