问题 解答题
计算:
(1)(2
3
5
)0+2-2×(2
1
4
)-
1
2
-(0.01)0.5

(2)lg14-21g
7
3
+lg7-lg18.
答案

(1)(2

3
5
)0+2-2×(2
1
4
)-
1
2
-(0.01)0.5

=1+

1
4
×
2
3
-0.1

=1+

1
6
-
1
10

=

16
15

(2)lg14-21g

7
3
+lg7-lg18

=lg(14÷

49
9
×7÷18)

=lg1

=0.

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