Cosx=13.4*3/1 (учитывая √ )
40.2/1 или 40.2
x=-40.2/3
x=-13.4
[(a-5)/a]²=2²
a²-10+25/a²=4
a²+25/a²=10+4
a²+25/a²=14
M \ N = 1.2 ---> M = 1.2N
1) N \ M = N \ 1.2N = 1 \ 1.2 = 5\6
2) - 5M \ 3N = ( - 6M) \ 3 N = ( - 2 )
3) 3 + 2N \ M = 3 + 2N \ 1.2N = 3 + 5\3 = 9\3 + 5\3 = 14\3 = 4 2\3
4) 3M - 2N \ 2M + N = ( 3.6N - 2N) \ ( 2.4N + N ) = 1.6N \ 3.4N = 8\5 : 17\5 =
= 8\17