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UniLink"}],["$","meta","3",{"name":"description","content":"友達に問題を出されました。自作だそうです。「π^2が3の倍数でないことを示せ。」条件足りなくないですか?友達が間違っている気がします。私はやってみたんですが、なんか間違っている回答ができました。あまり証明とかやっていないので回答自体が変かもしれません。三の倍数だと仮定する。π^2=3kとおく。k=π^2/3よってkは三の倍数k+1=π^2+3/3よってk+1は三の倍数矛盾が生じるのでk、k+1は三の倍数ではない。このことよりπ^2は三の倍数でない。わかる方。間違っているとわかる方教えてください。"}],["$","link","4",{"rel":"icon","href":"/favicon.ico","type":"image/x-icon","sizes":"48x48"}],["$","link","5",{"rel":"icon","href":"/icon.png?2c0dc65a59843333","type":"image/png","sizes":"180x180"}],["$","link","6",{"rel":"apple-touch-icon","href":"/apple-icon.png?2c0dc65a59843333","type":"image/png","sizes":"180x180"}],["$","meta","7",{"name":"next-size-adjust"}]] 1:null 13:I[3903,["51","static/chunks/795d4814-03346c8d233b4adb.js","212","static/chunks/212-70508e17017a12c2.js","231","static/chunks/231-5dc9f3acdba63b0c.js","54","static/chunks/54-f848f8ba1c362ca7.js","23","static/chunks/app/advice/%5Bid%5D/page-186819a87df201a3.js"],"ClientInfo"] 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1a:I[6549,["51","static/chunks/795d4814-03346c8d233b4adb.js","212","static/chunks/212-70508e17017a12c2.js","231","static/chunks/231-5dc9f3acdba63b0c.js","54","static/chunks/54-f848f8ba1c362ca7.js","23","static/chunks/app/advice/%5Bid%5D/page-186819a87df201a3.js"],"CommentItemName"] 1c:I[3866,["51","static/chunks/795d4814-03346c8d233b4adb.js","212","static/chunks/212-70508e17017a12c2.js","231","static/chunks/231-5dc9f3acdba63b0c.js","54","static/chunks/54-f848f8ba1c362ca7.js","23","static/chunks/app/advice/%5Bid%5D/page-186819a87df201a3.js"],"AdOnAdviceList1"] 1b:Tf72,数学の応用問題を解くには二種類の力が必要です。 ㊀定石 公式等の理解 ㊁定石 公式等を使ってどう問題を解くか考える力 もし㊀ができていないと感じているならば チャートやその他の問題集を使って 分野別に勉強しましょう。 ㊀はできているならば 融合問題を解くことで 考える力を養いましょう。 もし融合問題が見つからないというならば Googleで 電数と調べてみてください。 各大学の過去問などが載っている 数学のサイトがあります。活用してみてください。 しかし”考える力”とはなんなのか 次の問題を解く際の僕の思考回路をお伝えしながら解いていこうと思います。 問題 Tan1°は有理数かどうか(2006年 京大) 僕の頭の中 ㊀「三角関数かー 確信はないけどおそらく無理数やろうなあ、、 背理法かなんかで証明すればええんかな、、?」 ここまでは誰でも閃きそうですね。 ㊁「有理数と無理数の話やから 分数うまく使って背理法やろうなぁ」 この発想は rute2の無理数証明での定石から思いつきます。 ㊂「tan=a/bでおいてもどうしようもないなあ。 cos=b/rute a2 b2になるだけやしなあ。」 この発想から逃れるのは少し難しいかもしれませんが、何度か試すと これじゃダメだと気づくはずです。 ㊃「ならどうやって分数の話に持ち込もうかな、、 あっ! tanの加法定理って分数じゃなかったっけ!」 これは日常的にしっかりとtanの加法定理を意識できているかどうかですね。 ㊄「じゃあどーせ背理法やし tan1°を有理数として 加法定理使ってみよかな。 tan(1-0)=tan1-tan0/1-tan1tan0=tan1 あれ 元に戻ってもた。」 ここでのポイントはtan1を有理数として背理法を使うことですが、これは㊁から明らかですよね。rute2=a/bっておいて背理法するでしょ? ㊅「次tan2はどうやろか tan2=tan(1 1)=tan1 tan1/1-tan1tan1 あれっ? tan1が有理数なら tan2も有理数になってもたぞ!?」 ここが最大のポイント! 整数の問題全般に言えることですが、方針がたちづらい時は 数を増やしたりして実験しましょう。 ∴例えば nが関わる問題なら n=1やn=2を代入してみるのです。 ㊆「tan3=tan(1 2)=... tan6=tan(3 3) これ続けてったらtan@全部有理数になんね? ってことはtan60も有理数なってまうやん!」 決定的な一打です。 ㊇「ならtan1が有理数ならtan60も有理数なるってこと示して終了やな!」 僕の思考回路を砕いて説明しました。 この問題は入試において有名な難問ですが、 所詮はこの程度です。 思考回路に特別なセンスが感じられるところありましたか? ないでしょう? 多くの定石を身につけていれば必然的にこのように解くことができるはずです。 自習で融合問題を解く際、わかってもわからなくても 自分で思考のフローチャートを書きながら解いてみてください。 もし問題が解けたなら 解答をみて 自分のフローチャートと見比べてみましょう。 問題が解けていないならば どこの発想が足りなかったのかしっかり分析しましょう。 長くなりましたが最後にまとめるならば 「この問題解けない! 解答みよ! 」だけはやめましょう。 「この問題 ここまではフローチャートかけたけど どうしてもここから進まない、、 解答みて どの思考が足りなかったか確認しよう、」 こうしましょう。 まだまだ時間はあるので 頑張ってください!1d:Tf4e,こんにちは!東京大学1年しんです 進研模試の(3)が解けないということでしたが、別にそれは恥ずかしい話でも何でもありません!私自身、進研模試のような模試でも最後まで解ききれない大問もありましたが、諦めず演習を重ねて何とか東大の入試問題(理系)でも戦えるようになりました。まだ、高一ということもあるので、投げ出さずじっくり取り組んで欲しいと思います。私なりにいくつかアドバイスをするので参考にしていただけたら嬉しいです! まず、青チャートを3、4周しているということですが、正解した問題を3、4周する必要はありません。それなら他教科の勉強に時間を使った方がいいと思います。間違えた問題にマークをつけたり、付箋を貼ったりして、間違えたものだけ解き直すようにしてください。 また、青チャートの例題だけを解いているということですが、青チャートの例題はその下に解法がのっているので、その解法を見ずに解き進めてください。解法に目がいってしまうなら、例題の下の練習問題を解くようにしてください。私は、例題を解いているとどうしても模範解答をちらちら見てしまって、いつまでたっても自力で答案を作れなくなるタイプだったので、練習問題を解いていました。 私の場合はちょっとペンを動かしながらいろいろ考えてみて、五分くらい経って解法が浮かばなければ、解答、解説を見るようにしていました。青チャートでやっていることは解法のパターン暗記なので、ずっと一つの問題に悩むというよりは、問題を見てすぐに解法が思いつく&実際に完璧な答案を書ける、という状態を目指して何度も反復していました。 量に関してはチャートを3、4周やっているなら十分すぎるくらいだと思います。むしろ、数学だけに勉強量が偏っているなら、英語とか、他の教科にもバランスよく時間を割いてください。 チャートをやっていて解けない問題が少なくなってきたなと思ったら、章末問題、エクササイズなども取り組むといいと思います。意外と難しくて、力がつきます。 青チャートが終わったら赤チャートをやるの?などと思うかもしれませんが、赤はやらなくていいと思います。というか、青チャート以上のものをこの時期にそこまでやる必要はないと思います。 数学を極めたいというのであれば別ですが(そのときは私はあまり参考にならないかも)、スタンダードに合格を目指すのであれば、高2までに青チャートを完璧にして、高3からプラチカ、一対一、過去問などに取り組んで盤石にするというのがいいかと思います。数学特化型はやはり成績的に不安定になりやすい(一般的に英語などの方が安定しやすい)ので、どの教科もまんべんなく今の時期は基礎を固めることが大切だと思います。 さいごに いろいろ書きましたが、分からないことやうまくいかないこともあるかと思います。私自身のアドバイスも一個人的な意見に過ぎないので、いろんな人の意見を聞いて自分にあったやり方を探してください。また、伸び悩んだときは、このアプリや学校、塾の先生など、自分の信頼できる人に相談して解決するようにしてください。正しい努力をすれば成績は必ず伸びます。 がんばってください!応援しています。1e:Tf02,センター試験の集合は、実数の集合を扱うことが多いため、数直線上に図示するのが有効なことが多いです。 目盛の間隔を正確に図示する必要はなく、それぞれの端の大小と、黒丸白丸があっているかが重要です。(黒丸の場合はその点を含む、白丸の時はその点を含まないことを表します。不等号に=が入っているかどうかの違いとも言えます。) 例えば、 p: x>1 q:x≦2 のように与えられていた時、右向きの数直線上に左から1と2の点を書きます。 pについては、x>1(つまり「xは1より大きい」)であることから、先ほど書いた1の点に白丸を書き、そこから右上がりに少し直線を書き、そこから右向きに直線を伸ばします。新幹線のような形になります。この形は、1の点を含まないことを表すもので、白丸と同じ意味ですが、ぱっと見で分かるように両方使います。また、この線がpであることをどこかに書いておいてください。 qについては、x≦2(つまり「xは2以下」)であるので、2の点に黒丸を書き、そこから真下に少し直線を書き、左向きの直線を伸ばします。こちらは、電車のような形になります。この形は、2を含むことを表すもので、黒丸と同じ意味です。こちらの線にも、qであることを書いておいてください。 このように、範囲を一つ一つ図示していくと、次のようになります。 _______________ p / 2 ---------○-----●------->x 1 | q --------------- これを見れば、「pかつq」や、「pまたはq」「p⇒q は真か偽か」はすぐに分かるはずです。たとえば「pかつq」なら、pとqが重なっているところなので、13については、半径1の円に内接する正六角形の周の長さと円周を比べていただければほとんど自明です。\n\nおそらく、そのお友達の出題の背景には、かつてゆとり教育で「円周率を3として扱う」場面があったことへの皮肉があると思われます。もしそうであれば、π^2は9で、当然3の倍数になります。\n\n話がそれましたが、ある数が整数でないことを示すには、その数に近そうな整数との大小を比較してあげるのが非常に効果的です。"]}]]}],["$","div",null,{"className":"mb-4","children":["$","$L16",null,{"adviserImageUrl":null,"adviserName":"黒澤","adviserDepartment":"京都大学工学部","adviceId":"TWCWs7sAwPradPWAChx8","numberOfFan":1,"clipsAvg":2,"adviceRateAvg":5,"profile":"地方の中堅校から現役で京大合格💮\n本番医学科最低点超え、共テ93%(840↑)✨\n京大冠模試第一志望学科内で1位(数学194/200、理科164/200)🥇\n\n主に理系の質問に答えていく予定ですが、共テレベルまでなら英語や地理、国語(特に漢文)まで対応します!"}]}],["$","div",null,{"children":["$","$L7",null,{"href":"https://ck.jp.ap.valuecommerce.com/servlet/referral?sid=3364577&pid=884970531&vc_url=http%3A%2F%2Fshingakunet.com%2F%3Fvos%3Dnrmnvccp0000100","rel":"nofollow","target":"_blank","children":["$","$L8",null,{"src":"/images/document_request_banner.jpg","width":3660,"height":1500,"sizes":"100vw","style":{"width":"100%","height":"auto"},"alt":"UniLink 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21:07"}]]}],["$","div",null,{"className":"text-xs whitespace-pre-wrap","children":"ありがとうございます!勘違いしていたことが発見できてよかったです。\n証明もしてくださり勉強になりました。\n友達に教えてもらった回答とほぼ一緒だったので安心しました。\nこれからも勉強頑張ります。\n"}]]}]]}]]}]}],["$","h1",null,{"className":"text-xl font-semibold","children":"よく一緒に読まれている人気の回答"}],["$","div",null,{"className":"mb-8","children":["$","div",null,{"className":"divide-y","children":[["$","div",null,{"children":["$","$L7",null,{"href":"/advice/4lEdlX0BTqPwDZPuymBG","children":["$","div",null,{"className":"flex items-center py-4","children":[["$","div",null,{"className":"flex-1","children":[["$","div",null,{"className":"mb-1","children":"数Ⅲについて"}],["$","div",null,{"className":"text-xs text-caption line-clamp-2 mb-1","children":"この質問に素直に答えるなら余裕で習得できるよ🙆‍♂️\n\nただ、前提として1A2Bが正しく理解できている必要があるよ!\n数3の範囲について少し説明するね。\n\n\n①平面上の曲線\n楕円とか双極線っていう、円の上位互換みたいなやつが出てくるよ〜。\n→数2の図形と方程式の応用だからそこがしっかり出来てないとダメ🙅‍♂️\n\n\n②複素数平面\n複素数を図形的に扱っていく単元だよ!図形を回転させれるようになるね🙆‍♂️\n→数2のいろいろな式の範囲の複素数がマスター出来てないと🙅‍♂️\n\n\n③関数と極限\n数2指数関数、対数関数、三角関数、数B数列ができたら、それを無限大までビヨーンって伸ばすとどうなるのってお話しだね。\n→上に書いた単元はマスターしよう!\n\n\n④微分\n今までの微分より関数が複雑になっていくよ!でもパターンがあるから網羅できれば大丈夫👌\n→数Bの微分をマスターしておこう!\n\n\n⑤積分\n体積とか曲線の長さを求められるようになるよ🙆‍♂️簡単ではあるけど計算が面倒になるから計算力も必要!\n→数Bの積分をマスターしておこう!"}],["$","div",null,{"className":"flex mb-1","children":[["$","svg",null,{"stroke":"currentColor","fill":"currentColor","strokeWidth":"0","viewBox":"0 0 24 24","className":"text-subPrimary mr-1","children":["$undefined",[["$","path","0",{"fill":"none","d":"M0 0h24v24H0V0z","children":[]}],["$","path","1",{"d":"M12 6c1.1 0 2 .9 2 2s-.9 2-2 2-2-.9-2-2 .9-2 2-2m0 10c2.7 0 5.8 1.29 6 2H6c.23-.72 3.31-2 6-2m0-12C9.79 4 8 5.79 8 8s1.79 4 4 4 4-1.79 4-4-1.79-4-4-4zm0 10c-2.67 0-8 1.34-8 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