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sythanghp123
2 năm trước
Cho 2 đtròn ( O;R) và (O';R') tiếp xúc ngoài tại B .Đường thẳng OO' cắt (O) tại A và cắt (O') tại C .Gọi MN là tiếp tuyến chung ngoài 2 đtròn (M thuộc (O) ; N thuộc (O') ) a) CM: ^MBN = 90* b) CM : KM.KA = KN.KC c) AM cắt CN tại K .CM tứ giác BMKN là hcn d) Gọi I là trung điểm của AC . CM MN vg góc với KI
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