M
messivippro
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
cho duong tron (O) va day AB . Hai tiep tuyen voi duong tron tai cac diem A,B cắt nhau tai P.M la mot diem bat ki tren cung nho AB . Tu M ke MD vuong goc AB ;ME vuong goc PA ;MF vuong goc PB.
a) chung minh cac tu giac AEMD va BFMD noi tiep duoc
b) chung minh hai tam giac EMD va DMF dong dang
c) goi giao diem cua AM va DE la I va giao diem cua BM va DF la J . chung minh AB song song IJ.