计算: (1)(25/9)0.5+(27/64)−2/3+(0.1)−2−3π0; (2)lg1/2−lg5/8+lg12.5−log89•log278.

问题描述:

计算:
(1)(

25
9
)0.5+(
27
64
)
2
3
+(0.1)−2−3π0
(2)lg
1
2
−lg
5
8
+lg12.5−log89•log278

(1)原式=[(

5
3
2]0.5+[(
3
4
)3]
2
3
+(10-1-2-3×1
=
5
3
+
16
9
+100−3

=100
4
9

(2)原式=lg(
1
2
×
8
5
×
25
2
)-
lg9
lg8
lg8
lg27

=lg10-
lg32
lg33

=1-
2
3

=
1
3