题目内容
计算:
(1)(
×
)6+(
)
-(-2008)0;
(2)lg
-lg
+lg12.5-log89×log278.
(1)(
3 | 2 |
3 |
2×
|
4 |
3 |
(2)lg
1 |
2 |
5 |
8 |
(1)原式=2
×6×3
×6+(2
×2
)
-1
=22×33+2
×
-1
=108+2-1
=109;
(2)原式=lg(
÷
×12.5)-
×
=lg(
×
×
)-
×
=lg10-
=1-
=
.
1 |
3 |
1 |
2 |
1 |
2 |
1 |
4 |
4 |
3 |
=22×33+2
3 |
4 |
4 |
3 |
=108+2-1
=109;
(2)原式=lg(
1 |
2 |
5 |
8 |
lg9 |
lg8 |
lg8 |
lg27 |
=lg(
1 |
2 |
8 |
5 |
25 |
2 |
2lg3 |
3lg2 |
3lg2 |
3lg3 |
=lg10-
2 |
3 |
=1-
2 |
3 |
=
1 |
3 |
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