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数学 高校生

Kパック模試ですm(_ _)m 1番最後のヌネなんですが、解説(3枚目)の→の置き換えるメリットを教えて頂きたいです🙏 よろしくお願いします。

第4問 選択問題)(配点20) 数列{an}の初項から第n項までの和をS,とおく,つまり Sn=Σanとする。 n k=1 2 数列{an}と{S}は関係式 を満たすとする。 800 23000 a1 = Sn=2n²-an (n = 1, 2, 3, ...) すと ET である。2011.0 Aad である。 ア 0100 00000.0 85000 88000 8000.0 8204.0T800.0 100.0 IT500 SERO.0 200.0 4.0 18061.08851.0 221 6 IS100.0 Sn+1- Sn=an+1 であることに着目することにより, 41 をaとnを用いて表 10. £$15.0, 8808309091o2, 2.80 030102131.0 3.0 0.0 DOLO EEE 0888.0 3088.0 an+1 = Opas oras 0 lappes sasse esss to I Skepa 2 b₁ = aparo a 0 2880.0 230.0 A2 = エオ オ イ ウ JOCUR 17. 2 し、解答しなさい。 750 SS20 PCS ant カ 168.0 C8SE.0 POSE .0 BES8.0 SISE.0 8816.0 128 8.0 2 018361.0 803e to 2880 188.0 BENE. EINE 0 B.T- bn+1 = arab tock. 2.0 Leap 200円 POTS 0 Shas n+ キ DEGE OOREST OLEMA SOSTE 1870. BOTE 0 LU いま,数列{bn} を数列{an}の階差数列とする,つまり bn=an+1-aro Saf 1.08.1- (n = 1, 2, 3, ...) 3.FI 0020.0 58000 800 erer' 'COCA O Sessers.o aos resto desh.0 SSS 0 TOST O ス 50CCP ク サ 110370 0805 001250188 000 SEED 0.1 SEDA.0 ケ haar o 63.00 E90.0 8804.08T8A.OITOP.0 F000.0 0300.0 18.0 18.0 8.1 TATE.0 18.0 82.0 D2TA.0 ATA.0 88.0 SETA.0 8STA.0 C10 KITA 2001 (数学ⅡⅠ・数学B 第4問は次ページに続く。) CRD OFEO EDENO bn+ シ 0 CON

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英語 高校生

質問です。 (5)のⅡ群のところは答えがクなのですが、私はカだと思ってしまいました、、、 また、(6)については、答えはイなのですが、ウだと思ってしまいました。 どうしてこれらの答えになるのかがよく分からなくて、、 教えて下さい〜!!! 宜しくお願いします。

3 次の英文は, 中学生の花子 (Hanako) が行ったスピーチである。 これを読んで、 問い (1) ~ (9) に答えよ。 (24,5) There are some people cleaning streets in my town every morning. Also, there are some *crows looking for something in the trash. Many kinds of trash are *scattered around the *dump by them. That is a problem of trash and crows. Many people don't want to *fight with crows, but they want to solve the problem. IA J There is one way to solve the problem. I often see yellow plastic bags for trash. I heard that crows 2[(7) put (1) see (5) the yellow / (I) in / () cannot / () the things] bags. If crows think that there isn't any trash in them, they will go to another place, and we don't have to fight with crows. [B] *However, many crows still come to dumps in my town. They learn quickly and understand well, and they know where to find something for their lives. So, they come back to look for it in trash if they think they can do that easily. What are they trying to find in our trash? If I can answer this question, I may find a better way to solve the problem of trash and crows. So, I started learning about crows. My uncle is studying about crows. He often watches crows in some places and tries to understand their lives. He 3 (tell) me about it last week. They get up very early in the morning and usually start looking for their food in the trash of some restaurants or food shops. In such trash, crows can find their favorite food like *French fries or *mayonnaise. My uncle said that they like *oily food. I thought it's interesting because I like the same food. [ C] Also, they want to find something for making their houses. For example, they need *soft things like dog hair or "cotton because they want to put their eggs on such things. I was surprised to learn that crows find these things very well. There are some better ideas to solve the problem of trash and crows, my uncle said. First, people should put a big *net over the trash. When there is a net, it is difficult for crows to scatter trash around a dump. Heavy nets with small mesh are better. Second, when people put their trash in the dump, they should be careful about the time. Usually, the trash is 4(collect) in the morning. Crows may come and scatter it before that if you put the trash in the dump the previous night. 【D If it is difficult for crows to get their food in our town, they will move to another place. 5My uncle knows what we can do to solve the problem of trash and crows because he always tries to understand them. I think he can see the problem from the side of the crows. 6 We don't want to fight with crows, but ? I've heard that the crows sometimes hit people. Do they want to fight with us? That may not be true. My uncle said that the crows are trying different ways to say, "Don't come around our house!" They want to protect their children when someone comes around their house. Crows are large birds and they can fly, so they look strong. However, they are afraid if someone is near them and they don't usually want to fight with us. So, they don't come around the trash when someone is there. I learned about crows and I understood them better than before. They are just trying very hard to get. things for their lives, and they can find them in our trash easily. So, I don't think they are bad. Scattering trash is a problem to us. However, if I see this problem from the side of the crows, then I will know what I can do to solve it. For example, I will not make much food trash, especially oily food trash, and I can be careful about my way of putting the trash in the dump. There is not an easy way to solve the problem of trash and crows, but now, I know it is important to think about it from the side of the crows. We often think about a problem only from our own side, but if we look at it from another side, we may find a better idea.

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数学 高校生

紫で囲んだところのように因数分解するのはどのようにしているんですか?

DATE fied from flask) fond F HAR 200 接線に垂直な直線 (法線) 点Pでない方を点Qとする、ただし、a≠0 とする。 曲線 y=x 上の点P(a, α²) における法線と、この曲線の交点のうち, (1) 法線の方程式を求めよ. Focus *[+2² halos $195. 接点で接線と垂直に交わる直線を法線と呼ぶ. (詳しくは数学Ⅲで学習) 点P(a, f(a)) における法線の傾きをmとすると, 接線の傾きが f'(a) のとき、 m.f'(a)=-1 つまり、m=f'(a) 1 frase (2-0)² + $99 ← fram thar (A) (-x)(o=o)G (1) f(x)=x2 とおくと,f'(x)=2x TEL より, 点Pにおける接線の傾きは, f'(a)=2a したがって, 点Pにおける法線の傾きをとすると 1 m・2a=-1より, m = __ (a+0) したがって, (2) 点Qの座標を求めよ. 1 微分係数と導関数 Px-a- CHERE (2) 曲線 y=x2 と直線y=- 2つの曲線① 2式からyを消去して、x=-x+α'+- BROOTRAN (x-2)(x+a+ 2a となる. 1 2a 接線の傾き f'(a)(0) ini よって, 点Pにおける法線の方程式は, y-a²=-2 / (x=a) £ y₁=y=-2/x+ a² + ²/²/2 2a x+a+1/12 の交点は連立方程式を解いて 交点のx座標を求め り、 る。 左辺に移項して因数 分解 点Pも交点の1つで 2a>=あるから,x=αる第6章 解になっている. 点Qのx座標は =0 (D)(8-DS) 1_22_1 "2a' --- a²+- *** V 4a² 1-2のとき、y=(-a-2 2a ·+1 することから よって、点Qの座標は, (-a- 4a² 法線の傾き [接線] まず, 接線の傾きを 考える. ( 接線の傾き) (法線の傾き) =-1 361 ジュー 2a 6)- 02 1 1030 f']]

解決済み 回答数: 2