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英語 中学生

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5 10 15 20 25 30 The Olympics were held in Tokyo in 1964. A few years ago before the Olympics, Japan had a big problem. It was a problem of communication. Many foreign people didn't visit Japan, and we had only, Japanese signs. For example, words like "i" or "" were on toilet doors. These signs were not understood by many foreign people. Japanese people at that time needed to make signs in many different languages for foreign people. But when they put many words on one sign, the "letters became too small. They could not easily read the sign. They had to think of ) signs for foreign people. Mr. Masaru Katsumi, a leader of a design team for the Olympics, had a great idea. everyone /to/ was easy / thought / understand he forit pictures. He wanted to make picture signs. These signs are called *pictograms and are used in many places now. Picture 1 Picture 2 Picture 3 Look at these pictures. Picture 1 shows a shower. Picture 2, shows a toilet. Picture 3 shows a restaurant. Foreign people can easily understand what each picture shows. They had to make pictograms which everyone could understand without any trouble. When they started to make them, one of the pictograms was a shower. Many Japanese people didn't know about showers at that time and didn't have one at home. One of the designers didn't even know the word "shower." One officer had to explain how to use it with a photo of a shower. The designer made the pictograms through the officer's words. With a lot of trouble and hard work, twelve designers needed three months and made pictograms for the Olympics. When the last pictogram was finished, Mr. Katsumi said to all the designers, "You did a great job, but this work is not for us. We did it for all Japanese people. Please write your names on this paper." The paper said that they'd like to give up the *copyright to the pictograms. They wrote their names on the paper. They gave up the copyright. One of the designers said, "Mr. Katsumi hopes that many people in many places will use the pictograms in the future. Money from the copyright is not important to Mr. Katsumi. He is proud that he is one of the members who worked for the Tokyo Olympics." In 2020, we are going to have the Olympics in Tokyo. Our life will change a lot. What kinds of new signs or pictograms will we see around us? (E) letter pictogram ピクトグラム(絵文字) designer www. デザイナー officer 役人 copyright 著作権

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数学 高校生

tanの範囲がどうしてこうなるか分かりません🙇‍♀️

整理すると 4sin20-(2+2√2)sin0+√2<0 数学 Ⅰ 147 ←sin0の2次不等式。 sin=t とおくと,0°≦0≦180°のとき 0≤t≤1 ...... ① ←t の変域に注意。 不等式は 412-(2+2√2)t+√2 <0 ゆえに (t-1) (2t-√2) < 0 よって1/1 √2 2 2 √2 ①との共通範囲は <t< 2 √2 2 135° 150% 21 ゆえに、 1/12 sin を解いて √2 2 30°<0<45°135°<0 <150° -1 0 45° 130° 練習 次の関数の最大値・最小値,およびそのときの0の値を求めよ。 @ 150 (1) 0°≦0≦180°のとき y=4cos20+4sin0+5 (2) 0°<0 <90° のとき y=2tan20-4tan 0+ 3 (1) cos20=1-sin20であるから y=4cos20+4sin0+5=4(1-sin20)+4sin0+5 =-4sin20+4sin 0+ 9 1x 4章 [(1) 類 自治医大 ] 練習 章[図形と計量] sin0=t とおくと,0°0≦180°のとき 0≤t≤1 ...... y を tの式で表すと (1) y=−4t²+4t+9=−4(t²−t) +9=−4(t-- +10 ①の範囲において, yは をとる。 t= =12で最大値10 t=0, 1で最小値 9 0°180°であるから t= t = 0 となるのは,sin0 0 から 0=0° 180° ← cose を消去して, sin0 だけの式で表す。 ←t の変域に注意。 YA 10. |最大 最小 9 1 最小 12 となるのは, sino= 1/2から 0=30° 150° y 1 150° h 30°- 0 √3 1x √3 2 2 t=1 となるのは, sin0=1から よって 0=30° 150°のとき最大値10 0=90° 0=0° 90° 180°のとき最小値 9 (2) tan=t とおくと,0° <0<90°のとき t>0 をtの式で表すと (1 y=2t2-4t+3=2(t-2t)+3 =2(t-1)'+1 ①の範囲において, yは t=1で最小値1を とり、最大値はない。 0° <0 <90° であるから t=1となるのは,tan01 から 0=45° よって 30 ←t の変域に注意。 y. 1 最小 0 1 0=45°のとき最小値1, 最大値はない 45° 0

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