题目内容

(1)计算:(
32
)6
-
7
5
×(
25
49
)
1
2
-(-2013)0

(2)已知log73=a,log74=b,用a,b表示log4948.
(1)(
32
)6
-
7
5
×(
25
49
)
1
2
-(-2013)0

=2
6
3
-
7
5
×
5
7
-1
=2-1-1
=0.
(2)∵log73=a,log74=b,
∴log4948=
1
2
log7(3×16)

=
1
2
(log73+log716)
=
1
2
(log73+2log74)
=
1
2
(a+2b).
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