题目内容
计算:
(1)2-
+
+
-
(2)log225•log3
•log5
.
(1)2-
| 1 |
| 2 |
| (-4)0 | ||
|
| 1 | ||
|
(1-
|
(2)log225•log3
| 1 |
| 16 |
| 1 |
| 9 |
(1)=2-
+
+
-
=2-
+2-
+
+1-1
=2•2-
+
=
+
=2
(6分)
(2)=log252•log32-4•log53-2
=
•
•
=16(6分)
| 1 |
| 2 |
| 1 | ||
|
| 1 | ||
|
| 1 |
=2-
| 1 |
| 2 |
| 1 |
| 2 |
| 2 |
=2•2-
| 1 |
| 2 |
| 2 |
=
| 2 |
| 2 |
| 2 |
(2)=log252•log32-4•log53-2
=
| 2lg5 |
| lg2 |
| (-4)lg2 |
| lg3 |
| (-2)lg3 |
| lg5 |
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