问题 解答题
(1)log3
427
3
+lg25+lg4+7log72
(2)(
[
3]2×
3
)6+(
2
2
)
4
3
-4(
16
49
)-
1
2
-
[
4]2×80.25-(-2005)°
答案

解(1)log3

427
3
+lg25+lg4+7log72=log
3
3
4
3
+lg(25•4)+2
=log33-
1
4
+lg100+2
=-
1
4
+2+2
=
15
4

(2)原式=(2

1
3
×3
1
2
)6+(2
3
4
)
4
3
-[(
4
7
)
2
]
-
1
2
-2
1
4
×2
3
4
-1

=2233+2

3
4
4
3
-4×(
4
7
)
-1
-2-1=108+2-7-3=100

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