Mathematics
Senior High

2と3が分かりません
教えてください

Answers

2)x軸およびy軸に接する円
→中心を(a,b)半径rとすると|a|=|b|=r
よって求める円を(x-r)^2+(y-r)^2=r^2と置いて
(1,2)を代入。
3)問題の趣旨が意味不明。

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