1) а) log5(1/5) = -1,б) log2(16*2^1/2) = log2(2^4*2^1/2) = log2(2^9/2) = 9/2 = 4,5
2) =(1/2)^1 * (1/2)^log2(3)= 1/2 * (2^-1)^log2(3) = 1/2 * (2^log2(3))^-1 = 1/2 * 3^-1= 1/2 * 1/3 = 1/6
3) Пусть само выражение = х, тогда: log0,2(0,0016) + 4log0,2(b) - log0,2(c) - 2/7log0,2(c)=
= 4 + 4log0,2(b) - log0,2(c) - 2/7log0,2(c)
4) Основания одинаковы - можно потенцировать: х = 16^1/2:8 *28 = 4:8*28 = 14
Х123456789
1 1,2,3,4,5,6,7,8,9
2 2,4,6,8,10,12,16,18
3 3,6,9,12,15,18,21,24,27
4 4,8,12,16,20,24,28,32,36
5 5,10,15,20,25,30,35,40,45
6 6,12,18,24,30,36,42,48,54
7 7,14,21,28,35,42,49,56,63
8 8,16,24,32,40,48,56,64,72
9 9,18,27,36,45,54,63,72