问题 解答题
(1)(2
1
4
)
1
2
-(-9.6)0-(3
3
8
)-
2
3
+(1.5)-2

(2) 计算:lg25+
2
3
lg8+lg5•lg20+lg22.
答案

(1)原式=(

9
4
)
1
2
-1-(
27
8
)-
2
3
+(
3
2
)-2

=

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

=

1
2

(2)原式=2lg5+2lg2+lg5•(1+lg2)+lg22

=2(lg5+lg2)+lg5+lg2(lg5+lg2)

=2+lg5+lg2

=3

单项选择题
单项选择题