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Mathematics Senior High

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Ⅱ. 次の英文の空欄 ( 11 ) から ( 20 )に入る最も適切な英単語を, a. ~d.の中から 1つ選びなさい。 解答は解答用紙1枚目 (マークシート方式)の所定の解答欄にマークし なさい。 2893 000 Lego bricks. (Image source: Wikimedia Commons-CC license) Car made from Lego bricks. Lego has unveiled its first bricks made from recycled plastic bottles and ( 11 ) that it hopes to include the pieces in sets within two years. The prototype 4x2 bricks have been made from PET plastic from ( 12 ) bottles with additives to give them the strength of standard Lego parts, and are the result of three years of ( 13 ) with 250 variations of materials. It has already ( 14 ) plans to remove single-use plastic from boxes, and since 2018 has been ( 15 ) parts from bio-polyethylene (bio-PE), made from sustainably sourced sugarcane. These parts are bendy pieces, such as trees, leaves and accessories for figurines. Tim Brooks, vice-president for environmental ( 16 ) at Lego Group, said the biggest challenge was "rethinking and innovating new materials that are as ( 17 ), strong and high (18) as our existing bricks and fit with Lego elements made over the past 60 years". He added: "We're committed to playing our part in building a sustainable future for generations of children. We want our products to have a positive ( 19 ) on the planet, not just with the play they inspire, but also with the materials we use. We still have a long 20 ) we are making." way to go on our journey, but are pleased with the Hillary Osborne, "Lego develops first bricks made from recycled plastic bottles", The Guardian, 23 June, 2021. (https://www.theguardian.com/lifeandstyle/2021/jun/23/lego- develops-first-bricks-made-of-recycled-plastic-bottles) (-)

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Mathematics Senior High

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506 第8章数 Check 例題 289 格子点の個数 解答 列 disol (E) を自然数とするとき, 次の条件を満たす整数の組(x,y) はいくつある tugal Staol 15coll Segol I-90 .sol.3.8.gol Sigol か. (1) p≤lyl≤2p, p≤lx|≤2p058 p²=Sagol (1) (2) x+2y≤2p, y≥0, x≥0TI «ĆÏUS?ĆU A U (学習院大改) (3) 0≤y≤500, 0≤x≤√y 4stor for 考え方 座標がすべて整数である点を格子点という. I=Dagal D-14gol (1),(2) 具体的な数を入れて考えてみるとよい。 たとえば, (2)では, YA p=1 1 20 p=2 1 2 XC 0 となり, p=1のとき, 1+3=4 gol 3 ここでは、与えられた条件を LLUS x 100_n. (3) 0≤x≤√y , (0≤) x²≤y x=p上にある格子点の個 数は, p=2 のとき, 1+3+5=9 p=3のとき, 1+3+5+7= 16 p=4 のとき, 1+3+5+7+9=25 (1) 領域は、 右の図のように, 1辺の長さかの正方形 4つ分 である. y 30 O 0≤y≤500, 0≤x≤√y ≤√500=10√5 = 22.4 より、 右の図のようになる. 0805=23-10- p=3 x=k上にある格子点の個数を考える. -2pi (x≥0 1x² ≤ y ≤500 と変形し 6 YA 3 2p P 0 -p -2p となっている. 10.2.0+81 HO 一般に,直線 y=k(k=p,-1, ..., 0) 上には,それぞれ1,3,5, …, (2p+1) 個の格子点が並んでいる. y p2px 3---(2,3) 0 2x YA 43 p=4 ... **** Hol CARDA g TERA 500円 aros-40-88- 0 p+1 カ - p, p+I 格子点 y=x² 22 x y=p, p+1, , 2p, -p, -p-1, ....... -2p の{2ヵ-(p-1)}×2=2 (p+1) (個) 同様にして, x=p, 2p, -p, -2p 上の格子点の個数は, それぞれ, 2(p+1) 個(エ+s線の数は2(p+1) 本 KERARU |x=p上の格子点の個 数は2(+1) 個 −ħ5, x=p, .···.··., 2p, 2pの直

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