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Cho nua duong tron (O) dg kinh AB. tu A va B ke2 tiep tuyen Ax va By . Qua diem M thuoc nua (O) ke tiep tuyen thứ căt Ax va By lan luot o E va F.
a) cm AEMO noi tiep
b) AM cat OE tai P, BM cat OF tai Q. cm MPOQ la hinh chu nhat.
c) ke MH vuong goc voi AB , (H thuoc AB) K la giao cua MH va ED. so sanh MK voi KH
D) r la bkinh dg tron noi tiep tam giac EOF. AB= 2R. cm 1/3 < r/R.
m.n thong cam . minh la mem moi. anh em giup minh cau d thoi nhe.
a) cm AEMO noi tiep
b) AM cat OE tai P, BM cat OF tai Q. cm MPOQ la hinh chu nhat.
c) ke MH vuong goc voi AB , (H thuoc AB) K la giao cua MH va ED. so sanh MK voi KH
D) r la bkinh dg tron noi tiep tam giac EOF. AB= 2R. cm 1/3 < r/R.
m.n thong cam . minh la mem moi. anh em giup minh cau d thoi nhe.