Grade

Type of questions

Mathematics Senior High

FOCU GOLD例題171 (2)の回答のオレンジの部分、なぜ≧に=は入らないのでしょうか。 教えてください🙇‍♀️

(1) 原点を通り, 曲線 y=log3x に接する直線の方程式を求めよ. (福岡大) 例 曲線 y=xの接線で、 傾きがーであるものの方程式を求めよ. 4 考え方 (1) 接線が曲線上にない定点を通る場合」 と 「(2) 傾きだけがわかっている場合」 る。まず、接点の座標を(a, f(a)) とおき,次の条件から,αの値を求める. (1) 原点(0,0)を通る (2) 傾きが 1/14 である そのとき,(1)は真数条件, (2) は の中が0以上であることに注意する。 解答 話 (1) f(x)=log3x とおくと, Focus f(x)=1/1① ・①f'(x)=(3x) 3x 接点の座標を(a, 10g3a) (a>0)とおくポイント mi ①より,接線の傾きは,f'(a)=1 だから,接線 a の方程式は, y-log3a=1/12 (x-a)② a 原点(0, 0) を通るから, 0-10g3a=1/12(0-a)より, 10g3c=1 より、3a=e YA e a=133 これは,α>0 を満たす. よって,②より 求める接線の方程式は, e y-log(3.)=3(x-²) *1. (2) f(x)=xとおくと、 e HEROINE 01 ffd 接点の座標を(a, va) (a>0)とおく ①より 接線の傾きは, f'(a)= 十人3 また、傾きは 1/12 だから、 2√a y=x 21-128 1 2√a 4 これは α>0 を満たす. したがって, 接点の座標 は (42) である. よって, 求める接線の方程式は y−2=1/(x−4) £Y), y=1/√x+1 ・① より, a=4 VA 2 ** 10 0/1 e 3 3 0 (√x)² = (x ² ) ² = ²/² x ² = ポイント 3 3x y=log3x IC 4x y=√x

Solved Answers: 1
English Junior High

このような英文を読むのに8分ぐらいかかってしまいます。筆記は30分しかないので、2、3分で読めるようになりたいです。 早く読めるコツを教えてください。

4 Read the passage and choose the answer which best completes each sentence (1) 1)~(4). We all know that any person has a dream while they are sleeping. We also know that it is difficult to remember dreams after we wake up. Most dreams are soon forgotten and they disappear like small bubbles in water. In addition, they often cannot be remembered at all after they are forgotten. Even if you can remember a dream soon after you wake up, perhaps you cannot remember it any more after getting out from your bed to make some coffee. Maybe you have had such an experience. Then, have you ever noticed that you were having a dream while you were sleeping? / Some people have had such an experience. It is called a lucid dream, and some scientists in the world do research on it. Actually, there are even research groups which focus on it. Why do they do research on lucid dreams? For one thing, there may be advantages for us. We will be able to avoid nightmares and make our dreams happier or more exciting if we can notice we are having dreams and we can control them like a pilot. Today, scientists do not know enough about lucid dreams and how to control them, so there are still many things to be done in the research. But it may be possible for everyone to have lucid dreams if science in the area improves more. Actually, that is one of goals that some scientists are trying to reach. According to a survey, over 75% of the respondents answered that they experienced a lucid dream at least once in their lives. Also, many reports about lucid dream experiences were given in history. We can find early reports on them in books from ancient cultures. For example, an ancient Greek doctor already tried to use lucid dreams as a kind of therapy over two thousand years ago. And controlling our dreams in our own ways was one of the important topics among early Buddhists in Asia.

Solved Answers: 1