题目内容
计算下列各式:
(Ⅰ)(lg2)2+lg5lg20-1;
(Ⅱ)2-(
)+
-
+2
×
×
.
(Ⅰ)(lg2)2+lg5lg20-1;
(Ⅱ)2-(
| 1 |
| 2 |
| (-4)0 | ||
|
| 1 | ||
|
| 3 |
| 6 | 12 |
| 3 |
| ||
(Ⅰ)原式=lg22+(1-lg2)(1+lg2)-1(2分)
=lg22+1-lg22-1=0(3分)
(Ⅱ)原式=
-(
+1)+2
×
×
(1分)
=-1+2×3
×2
×(
)
(2分)
=-1+×21+
-
×3
+
+
=5.(2分)
=lg22+1-lg22-1=0(3分)
(Ⅱ)原式=
| 2 |
| 2 |
| 3 |
| 6 | 12 |
| 3 |
| ||
=-1+2×3
| 1 |
| 2 |
| 1 |
| 6 |
| 3 |
| 2 |
| 1 |
| 3 |
=-1+×21+
| 2 |
| 6 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 3 |
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