题目内容
化简:
(1)
-(π-1)0-(3
)
-(
)-
;
(2)lg2•lg50+lg25-lg5•lg20.
(1)
6
|
| 1 |
| 8 |
| 1 |
| 3 |
| 1 |
| 64 |
| 2 |
| 3 |
(2)lg2•lg50+lg25-lg5•lg20.
(1)
-(π-1)0-(3
)
-(
)-
=
-1-
-(
)-2
=-16.
(2)lg2•lg50+lg25-lg5•lg20
=lg2(1+lg5)+2lg5-lg5(2lg2+lg5)
=lg2+lg2lg5+2lg5-2lg2lg5-(lg5)2
=lg2+2lg5-lg5(lg2+lg5)
=lg2+lg5
=1.
6
|
| 1 |
| 8 |
| 1 |
| 3 |
| 1 |
| 64 |
| 2 |
| 3 |
=
| 5 |
| 2 |
| 3 |
| 2 |
| 1 |
| 4 |
=-16.
(2)lg2•lg50+lg25-lg5•lg20
=lg2(1+lg5)+2lg5-lg5(2lg2+lg5)
=lg2+lg2lg5+2lg5-2lg2lg5-(lg5)2
=lg2+2lg5-lg5(lg2+lg5)
=lg2+lg5
=1.
练习册系列答案
相关题目