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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