場合分けのところからの④からどうやってmとnの値出してるんですか

156 重要 例題 96 2つの円の共通接線 円 x2+y2=1 ...... ...... (2 ① と円 (x-4)2+y2=4 を求めよ。 )に共通な接線の方程式 EX CHART & SOLUTION 円の接線 中心と接線の距離 d = 円の半径 r 基本錠 77 A 求める直線を y=mx+n とおいて、 2つの円に接する条件を考える。 接点⇔重解 よりも d=rの方がスムーズ。 Linf. が円②の半径に等しいとして解く方法もある。 ①上の点における接線が円 ②とも接するから,円②の中心と、この接線の距離 (解答編. 118 PRACTICE 96 別解 参照) 解答 2つの円 ①,②に共通な接線はx軸に垂直ではないから, 接 ...... 3 線の方程式を y=mx+n すなわち mx-y+n=0 とする。 YA 直線③が円 ①と接するとき,円 ①の半径は1であるから 1m0-0+nl 12 -=1 m²+(-1)2 よって |n|=√m²+1 ④ 直線③が円 ②と接するとき,円②の半径は2であるから |m・4-0+n| =2 √m²+(-1)2 よって |4m+n|=2√m²+1 ④ ⑤から 4m+n|=2|n| ゆえに 4m+n=±2n よって 4m=n または [1] 4m=nのとき 4m=-3n-s 1 ④から m=± 4 n=± (複号同順) √15 √15 [2] 4m=-3n のとき 3 4 h 5 m = ± √7" n=+- 17(複号同順) よって, 求める接線の方程式は ←|A|=|B|⇔ A=±B ←|4m|=√m²+1 から 両辺を2乗して 16m²=m²+1 よってm²=15 y=±- =(x+4), y=± = (3x-4) √15 PRACTICE 96° 円 (x-5)2+y=1と円x2+y=4 について (1) 2つの円に共通な接線は全部で何本あるか。 (2) 2つの円に共通な接線の方程式をすべて求めよ。 求める接線は4本ある。

答えは①です。②と④はどこがいけないんでしょうか？？おねがいします🙇🏻‍♀️

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答えは①です。これだとI was made to wait for〜.となると思うんですけど、この文が受け身なのは分かるんですけど、madeの後ろのtoがあるのが分かりません。おねがいします🙇🏻‍♀️

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答えは④です。どうして③だとダメなのか教えて欲しいです🙇🏻‍♀️

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答えは①です。decide not to Vの形だと思ったんですけど、これはtoの後ろにgoか何かが省略されているんでしょうか？またそうならどうして省略していいのか教えて欲しいです🙇🏻‍♀️

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答え合ってますか🥹🥹

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答え合ってますでしょうか😭😭

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答え合ってますでしょうか🥲🥲

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答えは①なんですけど、for my brotherがこんな感じでenough to doの中に入れれるのが分かりません。どうしてこんな風に文の中に入れれるんですか お願いします🙇🏻‍♀️

8. The desk is ① Small enough for 3 so small that my brother to move by himself. to logga & on 2o small so small bra & enough small for

答えは④なんですけど、選択肢にcatchingがあったらこれでもいいんですか？？

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