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Mathematics Senior High

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-1<x<1の範囲において」という条件が付加された場合を考えてみればよい。 Q このページと同様に, 119ページの2次関数のグラフとx軸との位置関係につい 2次関数 y=x?-2(a+1)x+a°-3a+2のグラフがx軸と異なる2点 120 第2章 2次関数 80 標準例題 2次関数のグラフとr軸との位置関係 81 発月 次の2 定数aの値によってどのように変わるか。 コーチ 求めよ ア=ar+br+c(aキ0)について, D=6°-4ac とするとき、 着眼 D>0 → (異なる)2点で交わる D=0 → 接する D<0 → 共有点なし 解答)y=0 とおいて ax-2(a-1)x+a-3=0 …① 与えられた2次関数のグラフとx軸との共有点のx座標は のの実数解である。 ①の判別式をDとすると 着眼 解答 ー=(a-1)?-a(a-3)=a°-2a+1-a'+3a=a+1 何故こうなるの?! したがって リ>0 すなわち 4 -1<a<0、0<a→0のとき 共有点は2個 )aキ0であることに D 4 =0 すなわち a=-1のとき 共有点は1個 意する。 <0すなわち aく-1のとき 共有点はない…密 a+lくo 次の2次関数のグラフとx軸との共有点の個数を調べよ。ただし,aは (類車 80-1 数とする。 (1) y=ーx+3x-a-3 これ 類題 80-2 (2) y=x°-4ax+(2a-1) わるのは, aの値がどのような範囲にあるときか。 代ン @&A ても、判別試で事足りるように思います。 なぜグラフなど扱うのですか。 -1<x<1の範囲において」 という条件が付加された場合を考えてみれはか。 場合には,放物繊線と x軸とが-1<x<1の (実 この 覚的に者えるi 鈴田 とし

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English Senior High

QuestionAとBの1について、私の回答で丸はもらえますか?教えていただきたいです 北大2017年の英作文の問題です。

Read the following passage. for my age. I leave home early and it takes about two hours on a crowded train to get to the office. I get Sunday off, but on the other days I'm usually in my office till nine o'clock, or even midnight on occasion. But I enjoy seeing the customers excited about our new products and services. Every August I take a 15 years. It's a secure job in a major company and I enjoy a relatively high salary six-day summer vacation, usually at my parents' place in Toyama. It's nice to Thave been working for a Japanese cell phone company in Tokyo for the last 2017年度(3] 32 a or the space of the countryside after my cramped apartment in the suburbs. However, I spend two days travelling there and back, and then it's straight back to work the next day. Last summer, however, I was able to take 10 days off in August and used the rare chance to take my wife on a foreign holiday by going to visit my old friend, Pierre, in Paris. He and I met at university in the US nearly 20 years ago when we were both international exchange students. We shared a love of tennis and S0on became good friends, and have stayed in touch. He now works as a supervisor in a post office in eastern Paris. It was lovely to see Pierre again and spend time in the spacious apartment he shares with his wife. I was very surprised to find that they were just back from a month-long summer vacation in southern France and Switzerland. Pierre told us that this is perfectly normal in his job, and couldn't believe his ears when I mentioned that my usual vacation is around a week and that I work 12 hours a day, six days a week. His usual workday, he said, was from 9:00 to 16:00. He wasn't joking ; he was back home by bicycle by 16:20 every day. He likes his job as the postal service fulfills a vital function in society by connecting people both aomestically andinternationally. On hearing his story, though, I began to reflect upon my own life and work. AmI working to live, or just living to work ? Answer questions A to C in English. You may use words and ideas from the Lext, but you must not copy complete sentences.

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