题目内容

(1)计算:(0.0625)-
1
4
-[-2×(
7
3
)0]2×[(-2)3]
1
3
+10(2-
3
)-1-(
1
300
)-0.5

(2)计算:
lg23-lg9+lg10
(lg
27
+lg8-lg
1000
)
(lg0.3)(lg1.2)
(1)原式=(
1
2
)
4×(-
1
4
)
-22×(-2)+
10(2+
3
)
(2-
3
)(2+
3
)
-
300

=2+8+10(2+
3
)-10
3
=30

(2)原式=
lg?23-2lg?3+1
?(lg?
27
×8
1000
)
lg?
3
10
?lg?
12
10
=
(lg?3-1)2
?(
3
2
lg?3+3lg?2-
3
2
)
(lg?3-1)?(lg?3+2lg?2-1)

=
(1-lg?3)?
3
2
(lg?3+2lg?2-1)
(lg?3-1)?(lg?3+2lg?2-1)
=-
3
2
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