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English Senior High

答えと解説お願いします。。。

学習日 7 Unique Houses Around the Worlc 世界中の珍しい家 1 There are many unique types of houses around the world. They are different depending on the climate, areas or the people's way of living. 2 Can you imagine a house you can move? You can see such houses in 'Mongolia. People living there have to move their houses when their animals have モンゴル finished eating the fresh grass in that area. So they live in a kind of tent which is 1) 5 Its *2framework is covered with a white *3 cotton cloth. They can 綿布 What a convenient easy to move. 骨組み easily fold and carry it when they move to a new place to live. 2) house they live in! 3 Some people live in floating houses on **the Amazon River. They are built of アマゾン川 10 wood and are tied to trees very near the river, só they' don't float away. Some are painted and others aren't. Why do they make such houses on the river? *5The height 土地の of the land above sea level is very low, and the land is sometimes under water. 海抜 Thereforè, ", it is dangerous to live on the land. 4 You can also see houses above the water in **Malaysia. Many people live in these houses built of strong wood to protect them from the sea water. Surprisingly, 15 the people make villages there and their houses have *7official addresses even thoug" they are not on land. 5 As you can see, there are many types of houses around the world. Someumo they may not look like homes. But they are truly people's homes! People m different types of houses because of different climates and ways of living. 1s 20 1 280 words safe way.

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Mathematics Senior High

mCk=の後の(m−k)が何故あるのかわかりません。

例題8 二項係数と倍数 1 章 mを正の整数とするとき, 次の問に答えよ。 (1) 二項係数の和 m Co+ mCi + m C2+· + m Cm-1 + m Cm を求めよ。 2 m が素数であるとき,1ハをハm-1 を満たす整数 kに対してm Ck は m の倍数であることを示せ。 mが素数であるとき, 2"-2はmの倍数であることを示せ。(関西大) 1金) 例題6 (®Action 二項係数の和は, (1+x)” の展開式を利用せよ m! (2) mC。 がmの倍数=→ mCk = m× (整数)の形に変形する。 D (3) 前問の結果の利用 1公) も。 (1)を利用すると に(2)を利用 2"-2= (mCo+Ci+ mC+ … + Cm-1+mCm) -2 これが m×(整数)の形に変形できることを示す。 二項定理を用いて (1+x)" を展開する。 解 (1)(1+x)" ="CotmCix+ mCar +……+Cm-1X"-1 + m Cmx" x=1 を代入すると m Co+ m Ci+mC2+ +mCm-1+ m Cm = (1+1)” = 2" (2) 1<k<m-1 を満たす整数えに対して -10 例題 6 m! m m×(整数)の形にするた めに,mでくくり出す。 1SkSm-1 であるこ とに注意する。 C ニ k(k-1)!{(m-1)- (k=1)}! m m m-1Ck-1 k この式はよく用いられる。 p. 26 Play Back 1参照。 よって km Ck = mm-1 Ck-1 ここで,mC, ミ-1 C&-1 は整数であり,また,mは素数 であるからmとんは互いに素である。 したがって,m Ce は mの倍数である。 91<k<m-1 である ことに注意する。 () 0 1! - 整式·分数式の計算 思考のブロセス

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