题目内容
(1)(2
)
-(-2013)0-(3
)-
+(
)-2;
(2)log2.56.25+lg0.001+ln
+2-1+log23.
1 |
4 |
1 |
2 |
3 |
8 |
2 |
3 |
3 |
2 |
(2)log2.56.25+lg0.001+ln
e |
分析:(1)化带分数为假分数,化负指数为正指数,然后运用有理指数幂的运算性质化简求值;
(2)把对数的真数化为乘方的形式,然后直接利用对数的运算性质化简.
(2)把对数的真数化为乘方的形式,然后直接利用对数的运算性质化简.
解答:解:(1)(2
)
-(-2013)0-(3
)-
+(
)-2
=(
)
-1-(
)-
+(
)2
=[(
)2]
-1-[(
)3]-
+
=
-1-
+
=
;
(2)log2.56.25+lg0.001+ln
+2-1+log23
=log2.5(2.5)2+lg10-3+
+
×2log23
=2-3+
+
×3=1.
1 |
4 |
1 |
2 |
3 |
8 |
2 |
3 |
3 |
2 |
=(
9 |
4 |
1 |
2 |
27 |
8 |
2 |
3 |
2 |
3 |
=[(
3 |
2 |
1 |
2 |
3 |
2 |
2 |
3 |
4 |
9 |
=
3 |
2 |
4 |
9 |
4 |
9 |
1 |
2 |
(2)log2.56.25+lg0.001+ln
e |
=log2.5(2.5)2+lg10-3+
1 |
2 |
1 |
2 |
=2-3+
1 |
2 |
1 |
2 |
点评:本题考查了有理指数幂的化简与求值,考查了对数的运算性质,是基础的运算题.
练习册系列答案
相关题目