Из точки A проведены две касательные к окружности, причем B и C - точки касания, O - центр. Найдите угол BAC, если угол BOC равен 115 градусов.

Пошаговое объяснение:

1\8 + (5\9 - 1\2) = 5\9 - 1\2 = 10\18 + 9\18 = 19\18 + 1\8 = 76\72 + 9\72 = 85\72 = 1 13\72

3\25 + 0,5 - 4\5 = 0,12 + 0,5 - 0,60 = 0,62 - 0,60 = 0,02

(3\4 + 1\8) - 5\8 = 3\4 + 1\8 = 6\8 + 1\8 = 14\8 - 5\8 = 9\8 = 1 1\8

7 - 1 5\8 + 1 2\9 = 6 8\8 - 1 5\8 = 5 3\8 + 1 2\9 = 5 27\72 + 1 16\72 = 6 43\72

9 - 15\16 + 1\8 = 8  16\16 - 15\16 = 8 1\16 + 1\8 = 8 1\16 + 2\16 = 8 3\16

17 - 5 2\5 + 2 6\15 = 16 5\5 - 5 2\5 = 11 3\5 + 2 6\15 = 11 18\30 + 2 12\30 = 13 30\30 = 14

у + 5\7 = 3\5 + 1\10

у + 5\7 = 6\10 + 1\10

у + 5\7 = 7\10

у = 7\10 - 5\7

у =  49\70 - 50\70

у = -1\70

26 5\8 + х = 30

х = 30 - 26 5\8

х = 29 8\8 - 26 5\8

х = 3 3\8

Computer pluses:
Helps with study, it is possible to use as a training apparatus in the course of formation of educational skills;
Gives the chance to support a close connection with friends in other cities;
Source of reception of the various information;
Creativity freedom (creation of presentations, cards, a music writing, work with photos);
Development of logic thinking, ability to the analysis and synthesis;
Develops a self-trust, in the abilities to solve various informative problems;

Computer minuses:
Problems with sight;
Problems with a bearing;
Shortage of time for other useful affairs;
Narrowing a focus of interest, one-sided personal development;
Aggravation of neurotic lines of the person because of excessive attachment to the virtual world;
On the Internet there are ready abstracts, compositions, homeworks which can be copied blindly that отупляет and disaccustoms to mental work;
Mental loading;