题目内容
计算下列各式
(Ⅰ)lg24-(lg3+lg4)+lg5
(Ⅱ) (
×
)6+(
)
-
×80.25-(-2005)0.
(Ⅰ)lg24-(lg3+lg4)+lg5
(Ⅱ) (
| 3 | 3 |
| 2 |
3
|
| 4 |
| 3 |
| 4 | 2 |
(Ⅰ)lg24-(lg3+lg4)+lg5
=lg24-lg12+lg5
=lg
=lg10
=1;
(Ⅱ) (
×
)6+(
)
-
×80.25-(-2005)0
=3
×6×2
×6+3
×
-2
×2
-1
=32×23+3-2-1
=72.
=lg24-lg12+lg5
=lg
| 24×5 |
| 12 |
=1;
(Ⅱ) (
| 3 | 3 |
| 2 |
3
|
| 4 |
| 3 |
| 4 | 2 |
=3
| 1 |
| 3 |
| 1 |
| 2 |
| 3 |
| 4 |
| 4 |
| 3 |
| 1 |
| 4 |
| 3 |
| 4 |
=32×23+3-2-1
=72.
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