※中学1年生向け「文字と式」について,このサイトには次の教材があります. この頁へGoogleやYAHOO ! などの検索から直接来てしまったので「前提となっている内容が分からない」という場合や「この頁は分かったがもっと応用問題を見たい」という場合は,他の頁を見てください. が現在地です. ↓文字を使った式(1) ↓同(2) ↓同(3) ↓同(4) ↓同(入試問題) ↓一次式の計算(1) ↓同(2) ↓同(3) ↓同(4) ↓規則性を見つける ↓文章題(1) ↓同(2) ↓図形 ↓速さ・時間・距離(1) ↓速さ・時間(2) ↓関係を表す式(1) ↓同(2) 同(3)図形-現在地 ![]() ![]() |
小学校のときから使っている面積の公式などを,文字式で表わして,文字式に慣れよう. (1) 縦の長さが a ,横の長さが b の長方形の面積を S ,周の長さを L とすると,
S=ab
L=2a+2b |
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(2)
底辺の長さが a ,高さが h の平行四辺形の面積を S とすると,
S=ah
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(3) 底辺の長さが a ,高さが h の三角形の面積を S とすると, S= ![]() |
平行四辺形の半分と考えることができる![]() |
(4)
上底の長さが a ,下底の長さが b ,高さが h の台形の面積を S とすると,
S= ![]() |
平行四辺形の半分と考えることができる![]() |
(5) 対角線の長さが各々 a ,b であるひし形の面積を S とすると, S= ![]() |
長方形の半分と考えることができる![]() |
(6) 半径の長さが a の円の面積を S ,円周の長さを L とすると,
S=πa2
※ π は円周率 3.141592··· を表わす.
L=2πa |
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【 問題 1/8 】 下の選択肢から正しいものを選べ
※この問題は,上に書いた公式の単なる再現問題ですからヒントも解答もありません.必要に応じて上の解説を何度でも見てください. 縦の長さが a , 横の長さが b の長方形の面積を S とすると, S を表わす式は |
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【この問題の評価】未・・・
【 次の問題に進む 】
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