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English Senior High

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学習日 8 The Case of the Dentist's Patient 歯科医院での患者殺人事件 1 Dr. Williams, a New York dentist, was getting ready to take an *"X-ray on the left 1)9 side of his patient, Dorothy Hoover. The door behind him opened silently and hand appeared. It was wearing a white glove and holding an *"automatic pistol. Bang! Bang!Two *°shots sounded. Miss Hoover fell over in the chair. She was 5 dead. 2 “We've got a **suspect for the shooting,"” *5Inspector Winters told his chief at his office two hours later. “The elevator boy took a nervous man up to Dr. Williams' office, a few minutes before the shooting. The boy described the man and I am sure 2) he is John Burton. He was **in prison before. This evening we found him at his 10 *7rooming house. Ive told him that I only want to ask him a few questions." 3 Burton was brought in and he angrily said, “What is all this about?” orno os s “Have you ever heard of a Dr. Williams?” asked the Inspector. uon To bal 6W “No, I haven't. Why?” replied Burton. BA (6 “"Dorothy Hoover was shot to death less than three hours ago as she sat in a chair in Dr. Williams' office," the Inspector explained. 15 “I was sleeping all afternoon," said Burton. “An elevator boy says he took a man who looked ike you a moment before the shots were heard,” the Inspector told Burton. *It wasn't me," Burton insisted. “A lot of 3) *8 guys look like me. I haven't been 20 in a dentist's office since I came out of prison. You are mistaken." We have good *"proof to send you back to “No," *°interrupted the chief, 1 265 words I prison for a very long time!" VB yer bnet

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Mathematics Senior High

64(2)についてなのですが なぜ-1<3-r<3かつ2<r+2<5 と表記する必要があるのでしょうか?

マー 温装線 ガ=1の共通技線の方程式を求。 165 EXERCISES 17 2つの円 15 円の方程式。 16 円と直線。 -るとき,この直線を2円の 共通接 o 0 点A(8, 6) を通り, y軸と接する円のうちで, 半径が最も小さい円の方程式を 求めよ。 係によって変わるが,この問題 こあるときは,共通内接線と共通 2) 3回線x=3, y=2, 3x-4y+11=0で囲まれる三角形の内接円の方程式を求 めよ。 ((1)湘南工科大, (2) 近畿大] 94 太がある。 数学I x+3との交点を A, Bとし, そのx座標をそれぞれ。 -Mの座標が(5, 12)であるとする。点M が直線上 ー(m+7)x+5m- コ=0 の2解であり,点M =口となる。したがって, m=±_コ である。また, α<t<Bの範囲で, C上の点 画積は,P(ヶコ, -ロ)のとき最大となる。 (2) 3x-4y+11=0 にx=3を代入して そまず, 3直線で目 る三角形の頂点の」 11 ソ=5 (3, 5) (3-r,r+2) 4 調べる。 3x-4y+11=0 に y=2 を代入して 放物 よって,三角形の頂点の座標は (-1, 2)レ x=-1 2 Y(3, 2) 0 3 x 【名城大) ゆえに,求める円の半径をrとすると, 中心の座標は(3-r, r+2) と表され そ傾き m で点Mを通る。 1OS きれる。 -1<3-r<3 かつ 2<r+2<5 そ第1式から 0 ると が成り立つ。これを解いて 直線 3x-4y+11=0 と円の中心の距離は,円の半径に等しいか 0<r<3 第2式から 0 ら =r V3+(-4)-え よって |12-7r|=5r すなわち 12-7r=±5r 12-7r=-5rから 12-7ァ=5r から r=1 0<r<3を満たすものは このとき,中心の座標は r=6 r=1 (2, 3)

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