题目内容
(1)loga2+loga
(a>0且a≠1);
(2)lg20+log10025;
(3)2
×
×
.
| 1 |
| 2 |
(2)lg20+log10025;
(3)2
| 3 |
| 6 | 12 |
| 3 |
| ||
(1)loga2+loga
=loga2-loga2=0
(2)lg20+log10025=lg2+1+
=lg2+1+lg5=2
(3)2
×
×
=2×3
×12
×(
)
=21+
-
×3
+
+
=2×3=6
| 1 |
| 2 |
(2)lg20+log10025=lg2+1+
| lg25 |
| 2 |
(3)2
| 3 |
| 6 | 12 |
| 3 |
| ||
| 1 |
| 2 |
| 1 |
| 6 |
| 3 |
| 2 |
| 1 |
| 3 |
| 2 |
| 6 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 3 |
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