А1
log6(5)*log5(8) = log5(5)*log6(8) = log6(8)
log6(8) + log6(27) = 3log6(2) + 3log6(3) = 3log6(6) = 3*1 = 3
A2
0,8^(log0,8(2) + 0,36 = 2 + 0,36 = 2,36
A3
4log7(2)/log7(80) = 4log80(2)
4log80(2) + log80(5) = log80(16) + log80(5) = log80(80) = 1
A4
log3(a^3) = 12
3log3(a) = 12
log3(a) = 4
a = 3^4 = 729
log3(9*3^4) = log3(3^6) = 6
A5
log30(3) + log30(10) = log30(30) = 1
3 + 1 = 4
Остальное решай по аналогии. Будут вопросы - задавай! ;)
Удачи!