问题 解答题
求值:
(1)lg25+lg2lg50+23+
1
2
log25

(2)
3-2
2
+
3(1-
2
)3
+(
2
-1)0
+(0.027)-
1
3
答案

(1)lg25+lg2lg50+23+

1
2
log25

=lg25+lg2(lg2+lg25)+232log2

5

=lg25+2lg2lg5+lg22+8

5

=(lg2+lg5)2+8

5

=1+8

5

(2)

3-2
2
+
3(1-
2
)3
+(
2
-1)0
+(0.027)-
1
3

=

(
2
-1)2
+
3(1-
2
)3
+1+(0.33)-
1
3

=

2
-1+1-
2
+1+
10
3

=

13
3

选择题
单项选择题 A1/A2型题