题目内容
计算:(| 1 |
| 2 |
| (-2)2 |
| 1 |
| 2 |
| 3 | -125 |
| 3 | 0.064 |
分析:注意运算顺序:先乘方或开方,再乘除,最后加减.
解答:解:原式=
×2+
×(-5)-(-8)×0.4,
=
-
+3.2,
=1.2.
| 1 |
| 4 |
| 1 |
| 2 |
=
| 1 |
| 2 |
| 5 |
| 2 |
=1.2.
点评:此题主要考查了实数的运算,解题需熟练掌握乘方和开方运算,且一定要注意运算顺序.
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题目内容
计算:(| 1 |
| 2 |
| (-2)2 |
| 1 |
| 2 |
| 3 | -125 |
| 3 | 0.064 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 2 |
| 5 |
| 2 |