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数学 中学生

よろしくお願いします。 書き込みは合ってるかわかりません。

令和2年度 一般入試学力試験問題 [数学] (No.2) 【5】-A さんとBさんが,右図のように, 1つだけだと6人 座ることのできる長机をいくつか並べて、座れる人数を 考えました。 【A さんの並べ方】下の図のように長机n個を横1列に並べる。 【Bさんの並べ方】下の図のように長机n個を横1列に並べる。 次の(1)~(4)の各問いに答えなさい。 0.0 (1) 長机の数と座れる人数の関係を調べると下の表のようになりました。 のとのに入る適当な数を求めなさい。 長机の個数 座れる人数(Aさんの並べ方) 6| 10|14|の 座れる人数(Bさんの並べ方) 6 |0| 10|12 1|2|3 4 507 00 00 000○ g0 の f2832 p oo o 14-16 18 7f (2) 机を7個並べるとき, 座れる人数は, Bさんの並べ方の方が, Aさんの並べ方より 何人少なくなるか答えなさい。 (3) Aさんの並べ方で, 長机を n 個並べるとき, 座れる人数を nを用いて表しなさい。 nx4+2 4m+2

未解決 回答数: 1
数学 中学生

こちらの問題についてです。 解説があるのですが、線を引いたところから下がわかりません。 なぜ △ADO :△CDO=△ADO:△ABOとなるのでしょうか。 よろしくお願いします。

例題12〈相似な図形の面積比) 右の図の台形ABCDで, AD / BC, 対角線の交点を o △ADOの面積が18cm, △BCOの面積が50cm? であるとき,台形ABCDの面積は,△ADOの面積の A C B 何倍か。 解き方 AD I/ BCより,△ADO S△CBO △ADO:△CBO = 18:50 =9:25 = 3' :5 より、 相似比は3:5 OA:0C = OD: OB = 3:5 △ADO:△CDO = △ ADO:△ABO = 3:5=18:30 ACDO = △ABO = 30 [cm^] したがって,台形ABCD = 18 + 30 + 30 + 50= 128 [cm°]より, 64 128 - 18 = 9 64 よって, 倍 9 360

未解決 回答数: 1
数学 中学生

(1)~(5)まで教えてください🙇🏻‍♀️ 解説もお願いします。 至急お願いします💦

線分 BC の長さを求めよ。 線分 OE の長きを求めよ。 線分 BD の長さを求めよ。 人へOADのへDCB を証明せよ。 人へOAD とへDCB の面積比を簡単な 整数比で表せ。 をとる。 中心Oを通り線分ACに平行な直線を引き を D, 線分 BC との交点をE とする。 このとき, 次の各問いに答えよ。 分 AC の長きが6と を含まない弧 AB My NM
未解決 回答数: 1
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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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.
回答募集中 回答数: 0
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