题目内容
计算下列各式的值:(1)
3 | (-4)3 |
1 |
2 |
1 |
2 |
-1 | ||
|
2lg2+lg3 | ||||
1+
|
分析:(1)由指数幂的含义以及根式定义,
=(-4)3×
=-4,(
)0=1,0.25
×(
)-4=
×(
)4,即可求出结果.
(2)利用对数的运算法则直接化简即可..
3 | (-4)3 |
1 |
3 |
1 |
2 |
1 |
2 |
-1 | ||
|
1 |
2 |
2 |
(2)利用对数的运算法则直接化简即可..
解答:解:(1)
-(
)0+0.25
×(
)-4=-4-1+
×(
)4=-3;
(2)
=
=
=
=
=1
3 | (-4)3 |
1 |
2 |
1 |
2 |
-1 | ||
|
1 |
2 |
2 |
(2)
2lg2+lg3 | ||||
1+
|
lg4+lg3 | |||||
1+lg
|
lg12 |
1+lg0.6+lg2 |
lg12 |
lg10+lg0.6+lg2 |
lg12 |
lg12 |
点评:本题考查指数和对数的运算法则,解题过程中要细心,确保正确性,属于基础题.
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