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数学 中学生

数学の学力テストの問題です。助けて下さい。 ⑶で (x+8)(x-12)=0 までは分かるのですがそこからが分かりません。 なぜ急に  x=12 となるのですか?

6 同じ形の立方体を,たて,横に個ずつ、水平な床の上に3段に積み上げて直方体を作る。この 立体に対して,次の操作を2回行う。 【操作】 積み上げられた立方体のうち,2つ以上の面がまわりから見えている立方体を,すべて 同時に取り除く。 ただし、床と接している面はまわりから見えないものとし,立方体を取り除いても立体はくずれな いものとする。例えばx=6のとき、直方体にこの操作を2回行うと,下の(図1)→(図2)→(図3) のように立体は変化する。 (図1) 次の(1)~(3)の問いに答えなさい。 1回目の 操作 Hadsand ↑ (図2) (1) x=6のとき, 2回目の操作後に残る立方体の個数を求めなさい。 一番上の段にある立方体の個数は 真ん中の段にある立方体の個数は 一番下の段にある立方体の個数は 2回目の 操作 ア Ji 101 gnilool quote bloode toY Syllss di best of new ode 1 ellsS > wo of ti evig oals IT soa aral (2) 2回目の操作後に残る立方体の個数について, ア~ウにxを使った式を,それぞれ当てはまるよ うに書きなさい。ただし, カッコがつくときはカッコをはずし、最も簡単な形にしなさい。 また, rol abson) ni boste sus? ... asw aanbo otrovst esmalse x≧5とする。 イ ウ aby (図3) 16. 個, 個となる。 「 T (8) ixon sisniH diw aus (3)2回目の操作後に残る立方体の個数が296個であった。 xの値を求めなさい。 doodbe je mradi te gabloof ani Duy ( nato le zote ni bolasini ei oY ( muw dub sonone oth gini of answ ONLY I

解決済み 回答数: 1
英語 高校生

答えわかる方いますか、、?

問1 ✩:"23 notebook is yours, the blue one or the green one?" ★: "The green one." 1 Which 2 Who by 2✩: "What time [24] your soccer game start this Sunday? I want to see it." ★: "10 a.m." Ⓒ did 2 do 3 willMnO2 91'#W" : * BY TROY LEW WOH" : & r 3: "Yuta plays basketball well, right?" ★: "Yes, so he [25] become a professional player in the future." E 1 won't 3 going to stay OS" : * bib 0 2 may I llada Ⓒ 6:"28 is your younger sister?" "She's 11." How far Whose to nsw 1": ★ ob Ⓒ 4:"26 go fishing next Saturday?" ★: "Sounds good. I'm looking forward to it." daini boy bic" : AT 1 Did you 2 Shall we 8€ 23Y": ★ 3 Should I gaiub ybsents m'l ob yb69ıle 10 snob vhasıls av'IⒸ 5: "I can't finish my report." ★: "If I 27 enough time now, I would help you." nob voY": 21 Ⓒhave had 3 hadtud uoy insiÍT" : ★ toy IWⒸ 1 bid 0 2 will have "Suoy [BE] un radiord way 2900": ✰ an 2 How old mir 3 How many l'uso I.asY* :* 1261 26 ni jastasl radi atent 7: "Dad, my smartphone is broken. It [29 work." ★: "OK. I'll check it for you."Xattiq web zyswls DOY: VA 1 isn't 2 don'til I 3 doesn't ob nY": ★ seussed nadw ( emoled Ⓒ 8: "What 30 there now?" ★: "They are having a dance practice." anotteoup yn [0]: Brum are they doing do they do 3 did they do nƆ 2Y": enstilt snA 9:"Is Mike absent from school today?" ★: "That 31 be possible. I saw him in the teachers' room." Ⓒ might 2 should 3 can't

解決済み 回答数: 1
英語 高校生

丸つけ用に答えだけ簡単にお願いします🙏

問1: 23 notebook is yours, the blue one or the green one?” wairlonbed] Ore you os atlil big O To w woH" 3 Whose dart of thew 1" : * miwa Ⓡ ★: "The green one." 1 Which 問8 a Who 2 ✩: "What time [ 24 ] your soccer game start this Sunday? I want to see it.” ★: "10 a.m." goed & STO 1 did 2 do 3 will AM 02 91'>V 3:"Yuta plays basketball well, right?" ★: "Yes, so he [25] become a professional player in the future." E I won't 2 may 3 going to .ogs : bib 0 919W ob @ 問4 : 26 go fishing next Saturday?" ★: "Sounds good. I'm looking forward to it." daini boy bic" : ✰ ATM Did you 2 Shall we 3 Should Itiæ .æsY": ★ gniob ybseils m'l ob ybssils 10 How far sob vbssils ev'l Ⓒ 5: "I can't finish my report." ★: "If I 27 enough time now, I would help you." nob uoY": 21 have had 2 will have 3 had 'I jud.voy od: I llar2 Ⓒ LOY lliw I bia ( 問6 ☆: 28 is your younger sister?" "She's 11.” 1040 "Suoy [BE 1 How old.miri 3 How many jast as Ⓒ ni testest Ⓒ 7 ✩: "Dad, my smartphone is broken. It 29 work." ★: "OK. I'll check it for you." isn't 2900": ☆ a so I asY": ★ nsdt 1912st ,ettig web ayawls LOY": e 3 doesn't ob fɔ 1.29Y": ★ sausood nadw 2 don'til I stoted Ⓒ ☆: "What 30 there now?" ★: “They are having a dance practice." anoitesup yns [0]: 81 are they doing do they do do they do na 3 did they do nsƆ.29Y": ★ D terli al Ⓒ and a yerli STAⓇ 919rt 91A 0 9:"Is Mike absent from school today?" ★: "That 31 be possible. I saw him in the teachers' room." 2 should Ⓒ might 3 can't

解決済み 回答数: 1