10)log(2)8+3log(2)6-log(2)27=log(2)(8*216/27)=log(2)64=6
11)2log39=log(3)81=4
12)log(4)45=log(4)5+2log(4)3=1/b+2/a=(a+2b)/ab
log(4)5=1/log(5)4=1/b
log(4)3=1/log(3)4=1/a
5)(1/4)^(log(1/4)3 -2)=(1/4)^log(1/4)3 : (1/4)^-2=3:16=3/16
6)log(24)(1/4)+log(24)(1/6)=log(24)(1/24)=-1
7)log(2)12=log(2)3+2
log²(2)12-(log²(2)3+4log(2)3-5)={log(2)3 +2)²-(log²(2)3+4log(2)3-5)=
=log²(2)3+4log(2)3+4-log²(3)3-4log(2)3+5=9