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英語 高校生

英語長文問題です (1)イ?ウ? (2)ウ (3)イ (4)ア 解いてみたのですが(1)が分かりませんでした (2)(3)(4)もあっていますか?

14 Paraphrase Rapid Reading [速読 目標解答時間12分 ] 鶴と亀の物語から得られる教訓は何でしょうか。 Listening EX ON の 船 1 Once there were two cranes and a tortoise who lived by a lake and became good friends. They played together all day long, sunning themselves on the sand and swimming in the lake. They were very happy and wanted to be together forever. 2 But that year there was a drought*. For five months, no rain fell at all. The rivers and the land cracked. Each day, the little lake where the tortoise and cranes dried up, lived became smaller and smaller. 3 One day the two cranes flew into the air to see how things were, and came back in the evening saying, "Tortoise, everyone is moving to the Heavenly Lake. I think we should move too. If we stay here, we'll die of hunger and thirst." 13 end sky gra 14 to O P 1 5 The tortoise shut his little eyes and cried. "Oh, you can fly or hurry as fast as you 10 get to the Heavenly Lake. But I can neither fly nor walk fast. Within three days I will be nothing but an empty shell! We have been friends for so long. Please don't leave want, and me behind." 5 The tortoise cried so much that the cranes, unable to hold their own tears back, did not have the heart to leave him behind. So they decided to stay at the lake with the 15 tortoise for a while. Perhaps the rain would come in a few days. 6 But the weather did not change. Clear stars dotted the sky at night, and the sun was they thought hot and cruel el by day. The little lake was nearly dry. The cranes said again they must go. The tortoise knew that he could not keep them there any longer, so he pleaded* with them, saying "We have been friends for so long! Can't you think of a way to 20 take me along?" 7 They thought long and hard. After some time the cranes said, "Tortoise, we have a plan, but it will be difficult." 18 The tortoise asked eagerly, "What is it? What is it?" "We'll hold two ends of a stick in our beaks*, and you can hold on to the middle with 25 your mouth. Then we can fly, carrying you between us. What do you think of the idea?” 10 The tortoise was so happy that he nearly jumped. "Yes, yes! That's a good idea! Let's start at once!" 11 The cranes were very happy, too, but they had to give him a warning. "You must be NOTES drought : 干ばつ plead : 嘆願する 32 UNIT 8 beak (鳥の) くちばし )( ).no パート ごとの 音声 ON

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数学 高校生

(2)で、 ⑴より、のところからどうなっているのかわかりません 教えてほしいです🙇‍♀️

532 基本例題 25 内心の位置ベクトル 00000 3点A(a),B(b),C(c)を頂点とする △ABCにおいて,AB=5, BC=6, CA=3 である。また,∠Aの二等分線と辺BC の交点をDとする。 (1)点Dの位置ベクトルを」とするとき,をもこで表せ。 (2)△ABCの内心Iの位置ベクトルをするとき, i を a, b, c で表せ。 HART & SOLUTION 三角形の内心の位置ベクトル 角の二等分線と線分比の関係を利用 三角形の内心は3つの内角の二等分線の交点である。 (1) 右の図で ADAの二等分線であるから BD: DC=ABAC (2)Cの二等分線とADの交点が内心であるから 解答 AI:ID=CA:CD (1) ADは∠Aの二等分線であるから BD: DC=AB:AC=5:3 よって a= 36+57 35→ -b+- 5+3 8 8° (2)△ABCの内心Iは線分AD 上 にあり, CIは∠Cを2等分する AI:ID=CA:CD 33 p.527 基本事項 1 角の二等分線と線分比。 線分ABをminに内 B D 分する点P(D)は から 3 (1)より,CD=- BC= -x6= であるから 5+3 8 4 b=na+mb m+n 9 AI: ID=3: =4:3 よって3+4d_3u+d 4 4+3 → (*57=3+4(6+)}=++ (1)から INFORMATION 内心の位置ベクトル 14 7 5 ←BD DC=5:3 inf∠Bの二等分線を考 C 14 えても、同様に解答できる。 A(a),B(b),C(c) を頂点とする △ABCにおいて, BC = 1, CA=m, AB=nであ るとき,∠ABC の内心I(i)はi=la+mb+nc l+m+n 証明は解答編 PRACTICE 25 の続きを参照。 とされる。

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