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1b:T11a6,こんにちは！RIZと申します。
今回は夏休みに一番時間をかけた数学で点数が取れなくて悔しいとは思いますが、間違えた問題についてはしっかり復習して、もし本番で出題された時に間違わないきっかけになったと前向きに捉えましょう！あくまで模試は練習ですからね。
さて、数学の学習方法についてですが、まず数学は3つ大事な要素があります。1つ目が計算能力です。これは言わずもがなですね。2つ目が解法パターンを覚えていることです。典型的な問題の解き方を知っているということですね。最後3つ目が思考法です。これはある問題に対する解法を考えるときの過程ですね。「なぜ」その解法で解くのかということです。
以上を踏まえて、今回の模試では何が不足していたから出来なかったのか考えましょう。例えば時間が足りなかったとすれば、計算が遅かったのか、解法を思いつくまでに時間がかかったのかなどが挙げられますし、単純に解き方がわからなかったとしたら、その時答えを見て理解できた場合は3つ目の思考法が足りなかったと考えられますし、もし答えを見ても理解できない場合は2つ目の解法パターンの把握がそもそもできていないことが考えられます。ここで不足点を洗い出して今後の学習の糧にしましょう。
以下では、上記の3つの要素のうち、特に意識しないと習得できないであろう3つ目の思考法にフォーカスしてお話しさせて頂きます。夏休みの学習で多くの時間を割いたということは、恐らく2つ目の基本的な問題の解法は頭に入っている状態だったけれども、模試などの初見の問題になると解けなくなるという状態ではないでしょうか。(もし違ったら申し訳ないですが、今回はその状態を前提にします。違う場合はコメント欄で教えてください。)この時今までの学習で見直してほしいのは、ある問題に対して、「なぜ」その解法で解くのかしっかり理解していたかということです。例えば「自然数に関してある命題を示せ」といった問題があった時にその問題が解けなかったとします。そこで解答を見ると、数学的帰納法で解いていたとします。こうなった時に、単純に解答で数学的帰納法が用いられていたから、こういう問題は数学的帰納法で解けばいいのかと理解するだけではいけません。なぜ数学的帰納法で解くのかを考える必要があります。それは今回の場合、自然数という条件かつ証明問題であることから、ひとまず数学的帰納法を疑ってみるという思考法が存在するからです。他にも図形問題が出てきたら、①幾何的(図形の性質)に解くのか、②座標に置いて解くのか、③ベクトルで解くのか、などを考えたり、といった思考法も存在します。これらの例はとても単純ですが、意外とこの「なぜ」といったところまで考えていない人が多いです。この場合、単純に解法を暗記しているだけなので、すでに解いた問題は解けるものの、類題になると手も足も出ないという状態にも陥りかねません。数学はこのように、ある具体的な事例から、抽象的な「思考法」を考えることがとても重要です。この思考法は一般的に使えるので、初見の問題でも条件から適切な解法を選択することができるようになります。なのでもし今回の模試が出来なかった理由が、この「思考法」という要素が欠けていたからであれば、今まで使っていたテキストなどを見直して、「なぜ」その解法で解いているのか説明できるようにしてみると良いと思います。
最後になりますが、阪大の文系数学は基礎的なレベルの問題が多いです。今からでも十分間に合います。まずは焦らずに自分が間違えた理由を分析して、特に「なぜ」を考えて勉強してみてください。ご質問等ありましたらコメント欄でお願いします！1d:Tc3a,あんじさん、こんにちは。

共通テスト数学で8割とることが可能であるか、という質問ですがおそらく可能であると思います。

一橋社会学部に通っている友人がいるのですが、彼は数学が苦手で一年の進研模試で40点とかでしたし、私文に志望を変更しようとしたりしていましたし、数学の配点の小さい社会学部に出願したりしていましたが、共通テスト数学8割は取れていたと思います。(模試では取れていた記憶がありますが私たちの代は数学がとても難化した年だったので、本試では取れていなかったかもしれません。記憶が曖昧で申し訳ないです。)よって一橋大学法学部志望の貴方にも可能であると考えます。

現時点で取れていないとしたら共通テストに対する対策が足りていないと考えます。共通テストは、二次試験とは毛色の違った問題が出題されるので二次試験の対策だけしていると、二次試験の点数の割に共通テストの点数が取れない場合があります。

共通テストの対策では時間と癖のある問題に対する対応が必要となると思いますが、短期間で対策するならやはり過去問か予想問題を解くべきだと考えます。

あんじさんが、予備校に通っていらっしゃるのであればその予備校の開催する共通テスト模試の過去問が残っていないか、聞いてみるのも良いと思います。

共通テストで8割というと、計算ミスも含めるとつまづいていいのは大問一つくらいだと思いますので、苦手な単元以外はほぼ満点をとるくらいの意気込みが必要だと思います。私はベクトルでつまづくときがあったので他の単元は出来るだけ取り切りつつ、早めに終わらせてベクトルに十分な時間を残すことを心がけていました。

解く際のコツとしてはやはり時間を意識して、何分たったら諦めて次にいくかということを決めておくことがあげられるとおもいます。8割取るなら苦手単元以外は満点を狙うべきだと言いましたが、単元の最後の方の問題に固執するより時間を残した方が結果的に高得点になる場合もあります。

結論としては、共通テストの問題は極端に難しいものは少なく、十分に対策していれば8割以上の問題を解くことはできると思うので、時間配分と共通テストに特徴的な問題の対策をすれば8割得点することは十分可能である、ということになります。

最後に、自分は第一志望に落ちたら浪人するつもりだったのですが、いざとなると怖くなって練習で受けていた私大に進学しました。ですので、あの恐怖を乗り越えて浪人を頑張っている方には尊敬の念が絶えません。頑張ってください。応援しています。2:["$","main",null,{"className":"px-4 pt-4 pb-4","children":["$","div",null,{"className":"max-w-3xl mx-auto w-full","children":[["$","div",null,{"className":"mb-8","children":["$","$L7",null,{"href":"https://unilink-app.onelink.me/isbO/h6xeh63x?advice=qdfVJWcBTqPwDZPuR1M5","target":"_blank","children":["$","$L8",null,{"src":"/images/web_to_app_banner.jpg","width":3660,"height":1500,"sizes":"100vw","style":{"width":"100%","height":"auto"},"alt":"UniLink WebToAppバナー画像","className":"mb-4 rounded"}]}]}],["$","h1",null,{"className":"text-xl font-semibold mb-2","children":"この数学の問題を教えて下さい🙇"}],["$","div",null,{"className":"flex justify-between mb-4","children":[["$","div",null,{"className":"text-left text-xs text-caption","children":["クリップ(",0,") コメント(",2,")"]}],["$","div",null,{"className":"text-right text-xs text-caption","children":"11/18 16:59"}]]}],["$","div",null,{"className":"coach-mark mb-4","children":"UniLink利用者の80%以上は、難関大学を志望する受験生です。これまでのデータから、偏差値の高いユーザーほど毎日UniLinkアプリを起動することが分かっています。"}],["$","div",null,{"className":"mb-4","children":["$","$L13",null,{"clientImageUrl":"https://firebasestorage.googleapis.com/v0/b/unilink-48e75.appspot.com/o/images%2Fs_gqJZ1R84SHRtqydT.jpg?alt=media&token=82c144b0-8aa1-44c4-b465-cfbcef3f826d","clientUserName":"ともくん","infoString":"高3 埼玉県 一橋大学経済学部(70)志望","adviceId":"qdfVJWcBTqPwDZPuR1M5"}]}],["$","div",null,{"className":"mb-8","children":[["$","div",null,{"className":"leading-loose 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mb-4","children":[["$","div","advice-part-0",{"children":[null,"自然数を8で割った余りは0〜7になるのは理解できると思います。\nそこで、nを自然数とすると、\n8で割った余りが\n0→8n\n1→8n 1\n2→8n 2\n3→8n 3\n4→8n 4\n5→8n 5\n6→8n 6\n7→8n 7\nとすることですべての自然数を表すことができます。問題で聞いているのは平方数ということなので、それぞれを2乗すると、\n\n0→64n^2=8×8n^2\n1→64n^2 16n 1=8(8n^2 2n) 1\n2→64n^2 32n 4=8(8n^2 4n) 4\n3→64n^2 48n 9=8(8n^2 6n 1) 1\n4→64n^2 64n 16=8(8n^2 8n 2)\n5→64n^2 80n 25=8(8n^2 10n 3) 1\n6→64n^2 96n 36=8(8n^2 12n 4) 4\n7→64n^2 112n 49=8(8n^2 14n 6) 1\n\nとなります。\nすべて(8n ○)^2という式になる以上、n^2とnの係数は8の倍数になるので、自然数部分である余りの2乗部分を8で割った時の余りが平方数の余りになります。\n\n長くなってすみません。わからなかったらまた質問してください。"]}]]}],["$","div",null,{"className":"mb-4","children":["$","$L16",null,{"adviserImageUrl":null,"adviserName":"りーーー","adviserDepartment":"東北大学経済学部","adviceId":"qdfVJWcBTqPwDZPuR1M5","numberOfFan":2,"clipsAvg":9.5,"adviceRateAvg":5,"profile":"現役で東北大学に合格しました！\n高校時代は野球部で、勉強を始めたのは3年の夏からなので、短い時間の中でどう伸ばしていくかといった面についてはご教示できるかと思います！よろしくお願いします！"}]}],["$","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 パンフレットバナー画像","className":"mt-4 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items-center py-4","children":[["$","div",null,{"className":"flex-1","children":[["$","div",null,{"className":"mb-1","children":"数学の伸び"}],["$","div",null,{"className":"text-xs text-caption line-clamp-2 mb-1","children":"また失礼します\n\n数列と確率が解けないということですが、まず数列に関して 数列は高校数学の分野の中でも難易度が上がるほど見慣れない条件、漸化式がだんだん出てきます つまり現場での【実験】の要素がだいぶんに多いです なのでこれはゆっくり時間をかけて、解説を理解して素養を深めていけば良いでしょう\n\n確率、場合の数は設定は変わってもやっている作業は限られてくるので、この操作なら同様に確からしいからこの式つかう、これは余事象でやったほうがよさそう、これは反復試行などのことはすぐ見抜けるようにし、また自分の解答で何を区別し、何を区別していないか(または全て区別する)を毎回意識しながらやれば段々アウトプットもよくなってきます\n\nまた基礎固めで使っていた問題集、書き出さなくてもいいので問題見て解法を頭の中でいう練習は最後まで続けましょう きちんと書くわけではないので短時間で多くの問題に触れられます 計ゴリ以外の難問は多くの場合基礎固めで用いたパターンの組み合わが複雑だったり文字の条件がごちゃごちゃ入ってきたものになるので、その個別個別は完全に、解説書をかけるレベルまでの理解をお勧めします \nというか各問題の解説を自分で作るのが一番効果的ではあるので、特に理解が不十分である個別の要素が多く含まれてモヤモヤする問題は一寸の箇所にも理解の妥協をせず自分の言葉で解説するのが良いでしょう\n\n頑張ってください🙏\n\n\n\n\n"}],["$","div",null,{"className":"flex mb-1","children":[["$","svg",null,{"stroke":"currentColor","fill":"currentColor","strokeWidth":"0","viewBox":"0 0 24 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items-center py-4","children":[["$","div",null,{"className":"flex-1","children":[["$","div",null,{"className":"mb-1","children":"計算練習した方がいい分野"}],["$","div",null,{"className":"text-xs text-caption line-clamp-2 mb-1","children":"こんにちは。勉強お疲れ様です。\n「計算練習」をひたすらにやれ！という分野であれば、間違いなく微分積分です。ですが、私が次に推したいのは実は「複素平面」の練習なのです…。\n\n微分積分について\n理系の受験数学で、出ないことはない！と言い張れるくらいにはめっちゃ出ます。ほんとうに。\n必ず出る分野ならば、そこは「早く解く」ことができて、さらに「確実に正解する」ことができることが大事ですよね。「早く解く」、「確実に正解する」ともなれば、それに必要なのは計算練習です。微分、積分の練習については以下に記す通りにやるのがオススメです。\n\n微分の練習\n①時間制限を設けて、スラスラ微分する。\n（現時点の自分の全速力でかかった時間×0.8で設定してみてください。間に合うまで頑張りましょう。）\n②微分後（導関数）の形を覚えてしまう。\n（積分でめっちゃ役に立つんです。「微分形の接触（f(g)g'の形）」の際に、「これ、gの微分形じゃん！」ってすぐに見抜けるようになるのです。）\n\n積分の練習\n☆手を動かす前に頭で考える。 \n（適当に手を動かすのは練習になりません。「この積分は、どの解法で解くのかな…？」「これだ！これならいける！」ってなるまでは手を動かしてはいけません。）\n\n呼吸をするように積分しましょう！\n（そのために微分の練習が不可欠です。）\n\n\n複素平面について\n実は受験で出たら確実に解けるランキング第1位なんじゃないか？って思っています。複素数の解き方には数パターンしかないんです。出題のされ方もパターン化され切っています。「あ〜こういう系ね。」と分かるくらいまで練習していれば、確実に大問1個分正解できてしまうんです。\n\n「青チャートが一対一になっていて演習量に不満がある」ということでしたが、複素平面に関しては安心してください。青チャートに載っていない解法の問題はおそらく出ません。青チャートの複素平面の問題を全て完璧に解けるように何周も練習することもオススメします！\n\n\n受験勉強って結構モチベ保つのしんどいですよね。好きなお菓子食べたりするといいですよ。それと、数学に飽きたらほかの勉強しちゃっていいですよ。ほかの勉強が飽きた後に数学に帰ってくればいいんです。\n数学の問題集にもいずれ飽きが来ると思います。そうなったら1度過去問に手をつけてみましょう。（〇進の過去問データベースおすすめ！）\n過去問演習が1番数学の中で楽しいですよ！"}],["$","div",null,{"className":"flex mb-1","children":[["$","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":[]}],["$","path","1",{"d":"M12 6c1.1 0 2 .9 2 2s-.9 2-2 2-2-.9-2-2 .9-2 2-2m0 10c2.7 0 5.8 1.29 6 2H6c.23-.72 3.31-2 6-2m0-12C9.79 4 8 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items-center py-4","children":[["$","div",null,{"className":"flex-1","children":[["$","div",null,{"className":"mb-1","children":"英語を捨てる選択はありか"}],["$","div",null,{"className":"text-xs text-caption line-clamp-2 mb-1","children":"英語がそこまで苦手なら共テ対策だけでいいと思います！\nただ、共テで8割は取りたいですね、\n\n正直、共テで8割取れるくらいになれれば私立でも英語で大きなディスアドバンテージを背負うこともないかと思います(きついところもありますが、、😅)駿台模試を見る限り、数学が相当できるということなので、私立の数学受験でいけば全然合格できると思いますね！もし早慶も受かりたいなら慶應の商はおすすめですね。英語は量が多いのですが一つ一つはそこまで難しくないので、そもそもの解く量を絞ってやれば大コケすることもないですし、数学の平均点が本当に低いのでそこで大差つけれます！社会もそこまで難しくないです👍\n\n共テ利用だけの併願は危険かもです。浪人覚悟で横国に集中したい！という考えなら全然アリなのですが、どこか合格がほしいなら一般も考えた方がいいですね。共テ利用で良いところ受かったら一般は出願だけで受験しないというのもお金はもったいないですが、受験戦略としてはアリだと思いますよ🫣\n\n最後に共テ英語8割いくために！みたいなテーマで少し書こうと思います🤏\nまずは単語です。本当に1冊で大丈夫です。何かやってください🙇🏻それだけで単語で困ることはあんまないと思うので！単語帳を何も持ってないということはないと思うのでそれをやってもらえばいいのですが、一応僕が使ってたのは東進のセンター1800ってやつでした。今は共通テスト1800って名前だったと思います。いい単語帳でしたよ👍\nあとは、共テは時間配分ですね。8割とはいえ基本は全問題にチャレンジしたいです。なので時間配分が鍵になるわけですが、これは練習しかありません。でもただ闇雲に解きまくっても効果は薄いでしょう。大問ごとに時間を決めて、大問ごとに演習を行ってみてください。大問の配分と言われてもピンとこないと思うので僕の配分を書いておきますね。ただ、僕は英語得意で共テは2年とも97だったので少し速めです😂あくまで参考にして自分の配分を考えてみてください！！😉\n1a 1.5分\n1b 2分\n2a 3分\n2b 4分\n3a 4分\n3b 5分\n4   15分\n5   12分\n6a 10分\n6b 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items-center py-4","children":[["$","div",null,{"className":"flex-1","children":[["$","div",null,{"className":"mb-1","children":"わからない問題にかける時間について"}],["$","div",null,{"className":"text-xs text-caption line-clamp-2 mb-1","children":"それは分野によって異なります。\n例えば 微分積分の問題は15分程度考えてわからなかったら答えを見ても良いと思います。\nなぜなら 微積はわりとワンパターンなので覚えたら終いだからです。\nそれに比べて 整数問題はワンパターンでは解けません。なのでじっくり考えるべきです。 どうしてもわからない時はその問題を一旦解くのをやめて、時間をおいて考えてみてください。 意外とわかったりします。\n\n数学の偏差値を上げるためには 勉強の際 一問を一問で完結させないことがポイントです。 そのためには 問題を解いたら その類題も解いてみたり、難しい問題が出て来たら どこの発想がなくて解けなかったのかしっかり分析することがひつようです。\nそしてもし過去問演習や模試の復習でわからない問題が出て来たら、 解答をすぐに見るのではなく、 思考のフローチャートを書いてみてください。\n\n具体的にいうならば\n三角関数の問題を解く際\n㊀グラフ㊁加法定理㊂変換公式\n\n→㊂でいこう\nCosだけの式になったから\n㊀tで置換する㊁因数分解する㊂tanに変換してみる\nなどなどと 樹形図のように思考回路を記すんです。\nするとどの状況でどの発想が足りなかったのかが明確になり、次にも繋がる勉強になります。やってみてください。"}],["$","div",null,{"className":"flex mb-1","children":[["$","svg",null,{"stroke":"currentColor","fill":"currentColor","strokeWidth":"0","viewBox":"0 0 24 24","className":"text-subPrimary 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