题目内容
(1)计算:0.064-
-(-
)0+7log72+0.25
×0.5-4;
(2)计算:lg500+lg
-
lg64+50(lg2+lg5)2.
1 |
3 |
1 |
8 |
5 |
2 |
(2)计算:lg500+lg
8 |
5 |
1 |
2 |
分析:(1)直接利用有理指数幂以及对数运算法则求解即可.
(2)利用对数运算法则求解即可.
(2)利用对数运算法则求解即可.
解答:解:(1)0.064-
-(-
)0+7log72+0.25
×0.5-4
=
-1+2+(
)5×(
)-4
=
+1+
=4.
(2)lg500+lg
-
lg64+50(lg2+lg5)2
=2+lg5+3lg2-lg5-3lg2+50
=52
1 |
3 |
1 |
8 |
5 |
2 |
=
10 |
4 |
1 |
2 |
1 |
2 |
=
5 |
2 |
1 |
2 |
=4.
(2)lg500+lg
8 |
5 |
1 |
2 |
=2+lg5+3lg2-lg5-3lg2+50
=52
点评:本题考查有理指数幂以及对数运算法则,基本知识的考查.
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