... R Do T;,T2 la giao diem nen toa dQ cua cac diem = 2, ME fl, d(O,fl) ngoai, duOn~ tr~n Vi vay ill M luon ke diroc hai tiep tuyen den duong tron (C) Do Met: nen M(t,6-tj, T;, T2 I~ giao diem cua ... vuong can tai A ve R = J1O; IA trim (C) co tam = (0;-2) 1(1;-2) Ta co IM= IN va =>a= ~ G9i hai giao diem M ( Xl;m), (3) De PT (3) co hai nghiem Xl;X2 phan biet thi m2+4m-6 AM.AN ... =- M2 (14 17) 5;5 ,(~~) 5;5 =- =1 M MJ ~StVllsiif5 www.VNMATH.com Nh~n xet Hai diem MJ va M2 la giao diem va R = 5; di~m B (c ;d) thuoc duong thang cua (C) va dirong thang d qua tam I, vuong goc...