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数学 高校生

vision questⅡ English expression hope70ページ preview 1.date&time 2.numbers(sizes,measurements,etc) 3.prices&Phone numbers listening task 1.... 続きを読む

140 // TIT Activity for Communication 3 Preview Listen to the sentences below. 1 Dates & Times Listening for Numbers the on Enio 1. "The movie starts at 5:20. Can you be ready in ten minutes?" "OK. I'll try." 2. "What time is it now?" "It's 11:30." basalaila awohlsw 3. I have an appointment with the dentist this Thursday, the 10th. M 4. "When does school begin?" "It begins on April 8th." 5. Our school was established in 1965. 6. My family has lived in this town since 2005. 2 Numbers (sizes, measurements, etc.) 1. Two thirds of the students come to school by bus. 2. One mile is about 1,609 meters. 3. The city has a population of about 2.5 million. 4. The temperature dropped to 12°C. 5. APA Air Flight 125 for London will be departing from Gate 14 at 10:15. 3 Prices & Phone numbers 1. The price of this bag is $27.89, but you can have it at 10 percent off. 2. What would you do if you won 100 million yen in a lottery? 3. "A hamburger and a cola, please." "That'll be £2.99." 4. I need €20, but I'm €5 short. 5. My phone number is 612-750-5613. Listening Task Listen to the conversations and choose the correct answers. 1. How much of the earth's surface is covered by ocean? 1 more than one third more than one fourth 監督署 ER 70 3 more than two thirds 4 more than two fifths 2. When were the Olympic Games held in Atlanta? 1 in 1966 2 in 1969 3. How much did the dress cost? 1,100 yen 2 1,800 yen 3 in 1996 4 in 1999 S 8,000 yen ③ 13,000 48,800 yen bluros ④ 30,000 about 200,000 4. How many people can the concert hall hold? ① 1,300 ② 3,000 5. How many people live in the city? ①about 2,000 2 about 12,000 3 about 20,000 ① 207-7300 2207-7003 ③ 702-3300 6. What's the phone number of the restaurant? The number is 510- ④ 702-3003

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数学 高校生

数IIの三角関数の合成の利用の問題です。 (2)なのですが、解説を見ても理解ができなかったため、解説をお願いします。

(1) sin-cos0 = 1 002 のとき,次の方程式、不等式を解け。 例題 163 三角関数の方程式・不等式 〔6〕・・・ 合成の利用 **44 (2) 2sin(+) 6 +2cos√3 思考プロセス Action>> a sin0+ bcos, r sin(0+α) 既知の問題に帰着 サインとコサインを含む式 (1) sin-cos 0=1=> 合成 サインのみの式 sin (0- = 1 (2) まず 0 のみの式にしてみる。 を含む式… 6 (1) sine-cos =√√2 sin(0) であるから,与式は y 例題 O 162 sin(0) = 1 √2 例題 148 Π 6- =α とおくと,0≦02 より AUGLS7 ≤a< π 4 4 4 URSS π 3 この範囲で sinα = を解くと a = 2 TO π 3 6- π より 4 4 例題 162 (2) 2 = Π 4 " 2sin(+)+2cos= = √3 sin+3cos cose +2 cos COSO) + 2070200 0 = πT " 5809 π 44 π 2 3 sino + 2 2 12 よって, 与式は = = 2/3 sin (0+) JT 2√3 sin (0+)2√3 b5 sin (0+1) ≥ 1/1 2007 例題 148 0+ 8 + 1 = Π π =α とおくと,0≦02 より 3 3 1/12 Ra この範囲でsina 1/2 を解くと M 5 π, 3 6 1 sa≤or, 1x ≤a< 3 13 6 元 T Π T 5 13 TC 7 π, 3 < 6 6 TC 3 31 したがって TC 0≤0≤ 11 29 1630≦2のとき、次の方程式、不等式を解け。 (1) 3 sine-cos = -1 π P 023080 Action a Wy=sind y=2sin サイン& → 050 川 y=s X Π 4 よっ L 三角関数の合成 УА P 3 12 C 2.3 π У 3 ¦ √3 x F 13 1x

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