文字式の計算です。解き方教えてください、！

上 うらT 6トイテ - 2エャらち 7 男子 12 人, 女子 18 人の組で数学のテストをした。 この組の男子の平均点は Z点で. 女子の平均点は男子の平 均点より ヵ点高く 全体の平均点は c 点であった。このとき, ヵを6, cを使って表しなさい。 (NO で のて時8

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2 次方程式 2 次方租式とその解き方 いろいろな2次方程式② 軌還2次太程式y+ex+b=m0の解が一7 5であるとき。 次の問いに答えなさい。 (り) 解がー7. 5である2次方程式を. (ァ†p) の0 の彩で春きなきい。 1 ( (2) (で答えた式の左辺を展開しなきい。 ( (3) 2次方和式Tez+り=0のq。 の値を求めなさい。 ge ひi 6やて 記隅 2次方程葉デー10z+q=0の解の1つが5一"15 であることがわかっています。これについて.? 問いに答えなさい。 () なの値を求めをきい。 ン? 6あまの=の (2) この方班式のもう.1つの解を求めをきい。 Aerono ee greyomose

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2 次方程式 2 次方租式とその解き方 いろいろな2次方程式② 軌還2次太程式y+ex+b=m0の解が一7 5であるとき。 次の問いに答えなさい。 (り) 解がー7. 5である2次方程式を. (ァ†p) の0 の彩で春きなきい。 1 ( (2) (で答えた式の左辺を展開しなきい。 ( (3) 2次方和式Tez+り=0のq。 の値を求めなさい。 ge ひi 6やて 記隅 2次方程葉デー10z+q=0の解の1つが5一"15 であることがわかっています。これについて.? 問いに答えなさい。 () なの値を求めをきい。 ン? 6あまの=の (2) この方班式のもう.1つの解を求めをきい。 Aerono ee greyomose

中3数学です。最後の−y²がなんでy²になるのかよく分かりません。教えてください。 （x＋ｙ−2）（2x−ｙ） =2x²＋xy−4x＋2y−y²

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8 。 Xる (9) 。("eー) XdzP9エdg(9) Ke一) XA% (AG一) X 加

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加 たの下ま 束 (2)6 4 *. 大の確 2 1 回 あチAB 二 人導ばれる確 [回 AB C3kの硬貨を生時に投げ (①) 3覆とも表示出る確率 析区上 1) 取り軸しカ (2) 2舞と6自玉 たか2信 求めなき 月の訪の和24の6 月の数の和が5の佐迷 央| 3っの条 て 示 入っている。 それぞれの箱から| 内の問いに符えなさい。 (1) 取り出し方は, 全郎で何通りあ (2 取り出した3畠の玉がすべて同| さい (83) 取り唄された3個の玉の色が なさい。

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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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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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Miho: Ilello, Jack。 Hlow is your 」 1 JaDan7 Jack: Hlello、 Miho、 is ll right。 Ja Miho: What ( ) ① Jack: Well、 actually, there md and Tike Japanese food, se DeODle are ve our ([ ) Japanese food? one that llove. Miho: Oh、really? Tell me about it 妥 Can you ( り可( Miho: In Japan and in Korea? OK,T'II try. How can we make i2 ) _) iti52 Ithink iPs very popular jn Japan and in Korea. Jack: ICs ( rice and zo77。 We put many kinds of foods in the rice and rollit in zoが Miho: Oh. 1 know the answer! ICs zo77が2太 right?. Jack: That's right!

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(CO Eab 0ニケ テー=6のENy=I6である1 (8) テーー4のときyー8, メー2のときy=5である1光義 (9) 2度2, 5), (8. 9)を通る直線 (⑩ 2点(一1 6), (2, 3)を通る直線 ⑩ 2放(ご4 の, (⑫, を通る線 ※ 奈白は時下に使いなさい<