题目内容
计算:| (-2)2 |
| 3 | 27 |
| 1 |
| 3 |
| 3 |
分析:按照实数的运算法则依次计算,注意:
=2(
)0=1.
| (-2)2 |
| 1 |
| 3 |
解答:解:原式=2+
-3+1
=
≈
=0.866≈0.87.
| ||
| 2 |
=
| ||
| 2 |
| 1.732 |
| 2 |
=0.866≈0.87.
点评:本题需注意:一个数的算术平方根是非负数.任何不等于0的数的0次幂是1.
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题目内容
计算:| (-2)2 |
| 3 | 27 |
| 1 |
| 3 |
| 3 |
| (-2)2 |
| 1 |
| 3 |
| ||
| 2 |
| ||
| 2 |
| 1.732 |
| 2 |