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10 questions
log21 21=
3
2
1
0
log51=
0
1
2
5
log313 =
3
-1
1
9
log4(4)5
16
5
4
0
2log27 =
2
49
7
4
Cho
loga (b1.b2)=loga b1.loga b2
loga (b1.b2)=loga b1+loga b2
loga (b1.b2)=loga b1−loga b2
loga (b1.b2)=loga (b1+ b2)
log5125=
3
5
125
25
log327−log381=
31
-1
3
1
log2(16)31=
43
2
16
34
log28=
23
32
2
3
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