Grade

Type of questions

Mathematics Senior High

解答2(2)で、なぜ先に①と②の塗り方を決めるのですか?また、なぜ1個ずつ求めないのか教えて頂きたいです😣

「4色すべて使う」ことと「隣り合う領域は異なる色」であることに注意する。 解答1(1) 領域は4つなので, 4色すべてを使って塗る場合の数は, <同じ色を2回以。 344第6章 場合の数 例題 191 平面の色分けの問題 右のそれぞれの図において,分けられ(1) た領域を異なる4色すべてを使って塗り 分ける場合の数を求めよ。ただし,同じ 色を何回使ってもよいが,隣り合う領域 とは異なる色でなければならない。 Ste 7 3) 3) p.334 4) 考え方」 8 うことがない。 anh aP.=4!=D24 (通り) ( ) p.335 p.33€ 隣り合わない数。 同じ色を使う2箇所で, 題意を満たすものは, ②と うし 0J④, ③と⑤の2通りの場合である。 ま2とのの場合, {(②④), ①, ③, 5} の4箇所を4色で 塗ると考えて,«P4=4!=24(通り) 3と5の場合も同様にして, よって, 24 通り 24+24=48(通り) are合 和の法則 p.3 解答2 (2) 4色を A, B, C, Dとする. 4P2=12(通り) 領域D, 2の塗り方は, 3, 4, 6をD以外の3色で塗 る方法を樹形図を用いて考える。 のをA, 2をBで塗ったとき, 3, 0, 6をB, C, Dで塗る方 a A-B< 法は右の図のようになり,s419x8× 2) B C- D-C D 0, ②の塗り方 通りに対して,開 に4通りずつ考 B-C D: -C-D 4通り れる。 よって, 12×4=48 (通り) Focus 同じ色を使う場合は, 同じ色を塗る場所から考える 注》例題191(2)の解答2では, ①, ②の2箇所に塗る色を決 めれば,残りの3箇所の色の塗り方のパターンは同じで あることを利用している。 に円と考える。 練習 長方形を右の図のように6つの三角形に分けて 191 れらの三角形を 土 2) の

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English Senior High

答え合わせがしたいので教えてください

「I|次の文を読んで、あとの問いに答えなさい。( wのついた語は文末に注があります。 ns Sitting in the consultation room of a charming cosmetic surgery clinic in Washmgo. D.C., Hudson Young removed his mask under the satisfied gaze of his doctor. Like a grownns number of Americans, Young decided the right time to undergo plastic surgery was middle of a coronavirus pandemic, He knew he would have time to recover in the privacy ot his own home. The main reason, however, was that Young suddenly found himself face to face with his own image while participating in an increasing number of videophone and web A 「Its something new when you have to stare at your face for a couple of hours a day and there's only so much you can do with good lighting and good angles," Young said. The 52-year-old real estate agent had allready been a fan of cosmetic surgery. He had face lift, eyelid surgery and laser resurfacing for the first time in October. "When you see yourself on Zoom, you are shocked," he explained, as Dr. Michael Somenek examined his w barely visible scars. Young is far from the only one who has found himself disappointed with the reflection he has seen in the screen over the past year. Virtual consultations for cosmetic procedures have risen 64% in the United States since the beginning of the COVID-19 pandemic, according to the American Society of Plastic Surgeons. “We have seen an increase in the number of surgical cosmetic procedures that are directly related to Zoom," said Somenek, who has seen a 50% to 60% increase in customers. “I think the pandemic B has given everyone time to take care of those things that we've been putting off until later," explained Ana Caceres, who was able to work from home after C a plastic surgery operation she had wanted for a long time. She recovered at. her parents' house outside Washington after a December cosmetic surgery that helped her D deal with a source of insecurity she had had since adolescence. "I didn't have to days off, because I was still able to work from my bed with my lap-top," the 25-year-old said. “When life is going on and you have places to be, it's s0 easy to put things off," Caceres said, showing off a dress she says she now has the confidence to wear. And she has scheduled more cosmetic surgery. Her surgeon, Dr. Catherine Hannan, says consultations at her clinic in the IIS comit1 E have nearly doubled since the beginning of the pandemic. "Our patients have more lines because the last vear has been so hard. A face or boay change can have a psychological

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