问题
解答题
计算: (1)已知x>0,化简(2x
(2)log2.56.25+lg
|
答案
(1)(2x
1 |
4 |
3 |
2 |
1 |
4 |
3 |
2 |
1 |
2 |
1 |
2 |
=(2x
1 |
4 |
3 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
=4x
1 |
2 |
1 |
2 |
=-23.…(6分)
(2)log2.56.25+lg
1 |
100 |
e |
1 |
2 |
=2-2+
1 |
2 |
=6
1 |
2 |
计算: (1)已知x>0,化简(2x
(2)log2.56.25+lg
|
(1)(2x
1 |
4 |
3 |
2 |
1 |
4 |
3 |
2 |
1 |
2 |
1 |
2 |
=(2x
1 |
4 |
3 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
=4x
1 |
2 |
1 |
2 |
=-23.…(6分)
(2)log2.56.25+lg
1 |
100 |
e |
1 |
2 |
=2-2+
1 |
2 |
=6
1 |
2 |