题目内容
计算:
(1)
a
•b-2(-3a-
b-1)÷(4a
•b-2)
+(
)4(
);
(2)0.027 -
-(-
)-2+256
-(
)0+(
)-0.5+
;
(3)2(lg
)2+lg
•lg5+
.
(1)
| 5 |
| 6 |
| 1 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 2 |
| 3 |
| |||
| 6 |
| |||
(2)0.027 -
| 1 |
| 3 |
| 1 |
| 7 |
| 3 |
| 4 |
| 3 |
| 5 |
| 9 |
| 4 |
5-2
|
(3)2(lg
| 2 |
| 2 |
(lg
|
考点:有理数指数幂的化简求值,对数的运算性质
专题:函数的性质及应用
分析:(1)直接利用根式与有理指数幂的运算法则求解即可.
(2)直接利用根式与有理指数幂的运算法则求解即可.
(3)直接利用对数的运算法则求解即可.
(2)直接利用根式与有理指数幂的运算法则求解即可.
(3)直接利用对数的运算法则求解即可.
解答:
解:(1)
a
•b-2(-3a-
b-1)÷(4a
•b-2)
+(
)4(
)
=-
a
-
-
b-2-1+1+a
•a
=-
a-
b-2+a.
(2)0.027 -
-(-
)-2+256
-(
)0+(
)-0.5+
=
-49+64-1+
+
-1
=17+
(3)2(lg
)2+lg
•lg5+
=
lg22+
lg2lg5+1-
lg2.
=1.
| 5 |
| 6 |
| 1 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 2 |
| 3 |
| |||
| 6 |
| |||
=-
| 5 |
| 4 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
=-
| 5 |
| 4 |
| 1 |
| 2 |
(2)0.027 -
| 1 |
| 3 |
| 1 |
| 7 |
| 3 |
| 4 |
| 3 |
| 5 |
| 9 |
| 4 |
5-2
|
=
| 10 |
| 3 |
| 2 |
| 3 |
| 5 |
=17+
| 5 |
(3)2(lg
| 2 |
| 2 |
(lg
|
=
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
=1.
点评:本题考查根式以及有理指数幂的运算法则,对数的运算法则的应用,基本知识的考查.
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