题目内容
计算:
(1)lg22+lg5•lg20-1;
(2)(
•
)6-4(
)-
-
•80.25-(-2013)0.
(1)lg22+lg5•lg20-1;
(2)(
3 | 2 |
3 |
16 |
49 |
1 |
2 |
4 | 2 |
(1)lg22+lg5•lg20-1
=lg22+(1-lg2)(1+lg2)-1
=lg22+1-lg22-1=0;
(2)(
•
)6-4(
)-
-
•80.25-(-2013)0
=(2
•3
)6-4[(
)-2]-
-2
•(23)
-1
=2
×6•3
×6-4×
-2
•23×
-1
=22•33-7-2-1=98.
=lg22+(1-lg2)(1+lg2)-1
=lg22+1-lg22-1=0;
(2)(
3 | 2 |
3 |
16 |
49 |
1 |
2 |
4 | 2 |
=(2
1 |
3 |
1 |
2 |
7 |
4 |
1 |
2 |
1 |
4 |
1 |
4 |
=2
1 |
3 |
1 |
2 |
7 |
4 |
1 |
4 |
1 |
4 |
=22•33-7-2-1=98.
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