11 - Resolva as equações:
a) log(x+2)+log(10x+20)=3
b) log2(2x+8)-log2(3x-4)=1
c) log2(x+7)-log2(x-11)=2
d) log4 x-log8 x=1
e) log2 x-3log x+2=0
12 - Resolva as inequações:
a) log4(3x+6)<log4(4x-4)
b) log1/2 x2≥log1/2 9
c) log0.3(x2-1)<log0.3 8
d) log3 x+log3(x-8)<2