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数学 中学生

②の(2)を教えてくださいm(_ _)m 60×56-a×55=2700 になる理由が知りたいです!

直径60cmの半円のフレームを、重なりの長さがすべて することになった。 図1のように、長さ27mの花壇に 等しくなるように1列に並べる。 フレームは56個あ すべて使って花環にちょうど入るようにする。 ① ~③に答えなさい。 ただし, フレームの厚さは考えな いものとする。 フレーム- >50655 OTE> ~60cm 岡山県 (特別) √x a cm -27m J>U& INSTAN 重なりの長さが すべて等しい 図 1 図2のように, フレームを2個並べて, その長さを100cmにする には、重なりの長さを何cmにすればよいかを答えなさい。 61 27 m 2020年 数学 (7) ACE 重なりの長さ ② 香奈さんは、花壇に並べるフレームの重なりの長さを次のように求めた。次の<香奈さんの 考え>を読んで,(1) (3) に適当な数や式を書きなさい。 <香奈さんの考え> 例えば, 4個のフレームを並べるとき, できる重なりは3か所である。 同じように考 えると,nを自然数とし, n個のフレームを並べるとき,できる重なりはnを使って (1) か所と表すことができる。 フレームは56個あるから, n=56 である。 花壇の長さは27mだから、図3のように重な (2) =2700 となる。 これを解く りの長さをacmとすると, a を求めるための方程式は ことにより、重なりの長さは(3) cmにすればよいことがわかる。 100cm 図2

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数学 中学生

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Do you like dogss OU He dogs7 People ay tha dogs ae me oldew fiends orhumans Some 所 Te Vi People as Pets o tnlk about some Dogs we led by many peopls。 Now Tm gomg kinds of dogs w 「 Tes Working fordiabled peopkk。 They are not pes。 Toy are saiiance dogE 1p Japan。 there are three kinds of assistanee dogs。 They are gnide dogs。 service doB3 and Teng dogy Tody。 jn Japan。 more tan a momsand ssshtance dogs work for diabled PeoPIe To of thom are guide dogs。 The mumber of senrice dogs and hearing dogs is mot So large 人 OF Mey 1 2017。 here were onby abowe seveny senoe dogs mm Japan。 The number of hearing dogs was about he same. Guide dogs work for peopls who cannot see。 Guide dogs lead thc users when hy 8O 9 Herent places。 The dogs walk with the uscrs and gnuide them im a sefc way。 For Purposc。 guide dogs are ( A ) to go stmight along the road。 The users know hhe situaon j front of them thanks to the dogs、 and give dmectoons to the dogsy such as Wai FComer md “Sright go.” We can say that a gnide dog and the user work together to walk safely。 Service dogs work for people who cannot use their ams or legs ficcly。 Scrvice dogs do a Jot of things in daily lives for such people. For example。 they pick up things on the floor opcn. and close doors, and bring things from other places。 When something dangerous happens。 the dog can even run to some other people and ask thcm for hclp。 We can say that service dogs [で①語 Hearing dogs work for pcople who cannot hear。 Haring dogs can understand many kinds or sounds。 such as phones alanm clocksr cping babics nd so on。 The dogs 【 by /tel/ is heard / usi ig / thc users / their / what sound 】bodies: ER lece。 the dogs ouch the users and lead them to the place。 Hearing dogs can tcll many kinds of sonnds to the users and help them The law about assistance dogs says that they can go with the users imto many places Hike Testanrants, supenmarkets, and so on. So you have many chances to see thcm。 But you should amember one important thing about them。 Assiance dogs are not pets。 They are working 5r the users. so you must not talk to them or touch them。 OF course you must not give them ay food. Asshtance dogs md the usems respect eech othier ss Partnets。 When you meet an ssistance dog and te uscr in town。 just see what they dO。 TF they need some help。 lers ghve them a hand.

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数学 中学生

お願いします

Do you like dogss OU He dogs7 People ay tha dogs ae me oldew fiends orhumans Some 所 Te Vi People as Pets o tnlk about some Dogs we led by many peopls。 Now Tm gomg kinds of dogs w 「 Tes Working fordiabled peopkk。 They are not pes。 Toy are saiiance dogE 1p Japan。 there are three kinds of assistanee dogs。 They are gnide dogs。 service doB3 and Teng dogy Tody。 jn Japan。 more tan a momsand ssshtance dogs work for diabled PeoPIe To of thom are guide dogs。 The mumber of senrice dogs and hearing dogs is mot So large 人 OF Mey 1 2017。 here were onby abowe seveny senoe dogs mm Japan。 The number of hearing dogs was about he same. Guide dogs work for peopls who cannot see。 Guide dogs lead thc users when hy 8O 9 Herent places。 The dogs walk with the uscrs and gnuide them im a sefc way。 For Purposc。 guide dogs are ( A ) to go stmight along the road。 The users know hhe situaon j front of them thanks to the dogs、 and give dmectoons to the dogsy such as Wai FComer md “Sright go.” We can say that a gnide dog and the user work together to walk safely。 Service dogs work for people who cannot use their ams or legs ficcly。 Scrvice dogs do a Jot of things in daily lives for such people. For example。 they pick up things on the floor opcn. and close doors, and bring things from other places。 When something dangerous happens。 the dog can even run to some other people and ask thcm for hclp。 We can say that service dogs [で①語 Hearing dogs work for pcople who cannot hear。 Haring dogs can understand many kinds or sounds。 such as phones alanm clocksr cping babics nd so on。 The dogs 【 by /tel/ is heard / usi ig / thc users / their / what sound 】bodies: ER lece。 the dogs ouch the users and lead them to the place。 Hearing dogs can tcll many kinds of sonnds to the users and help them The law about assistance dogs says that they can go with the users imto many places Hike Testanrants, supenmarkets, and so on. So you have many chances to see thcm。 But you should amember one important thing about them。 Assiance dogs are not pets。 They are working 5r the users. so you must not talk to them or touch them。 OF course you must not give them ay food. Asshtance dogs md the usems respect eech othier ss Partnets。 When you meet an ssistance dog and te uscr in town。 just see what they dO。 TF they need some help。 lers ghve them a hand.

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