Пожалуйста помогите решить номер 204, 205, 206

204.1: a = 5
log5(5) = 1
log5(1/5) = -1
log5(sqrt(5)) = 1/2

204.2: a = 2
log2(64) = 6
log2(1/8) = -3
log2(128) = 7

204.3: a = 7
log7(7) = 1
log7(1/7) = -1
log7(49) = 2

204.4: a = 2
log2(4) = 2
log2(1/16) = -4
log2(1/64) = -6

205.1: a = 3
log3(243) = 5
log3(1/81) = -4
log3(27) = 3

205.2: a = 1/5
log1/5(5) = -1
log1/5(25) = -2
log1/5(1/625) = 4

205.3: a = 1/2
log1/2(4) = -2
log1/2(8) = -3
log1/2(1/32) = 5

205.4: a = 1/3
log1/3(3) = -1
log1/3(9) = -2
log1/3(1/27) = 3

206: 
1) log12(3) + log12(4) = log12(3*4) = log12(12)=1
2) log7(98) - log7(2) = log7(49) = 2
3) log2(5/35*56) = log2(8)=3
4) log1/3(5/5*9) = log1/3(9) = -2