题目内容
计算:
(1)(-4
)-(-5
)+(-4
)-(+3
)
(2)-14-(1-0.5)×
×[2-(-3)2].
(1)(-4
| 7 |
| 8 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
(2)-14-(1-0.5)×
| 1 |
| 3 |
分析:(1)先去掉括号,再按加法的运算法则分别进行计算即可;
(2)先算小括号里面的,再算中括号,最后进行相加即可.
(2)先算小括号里面的,再算中括号,最后进行相加即可.
解答:解:(1)(-4
)-(-5
)+(-4
)-(+3
)=-4
+5
-4
-3
=-4
-3
+5
-4
=-8+5
-4
=-6
;
(2)-14-(1-0.5)×
×[2-(-3)2]=-1-
×
×[2-9]=-1-
×(-7)=-1+
=
.
| 7 |
| 8 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 7 |
| 8 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 7 |
| 8 |
| 1 |
| 8 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 4 |
(2)-14-(1-0.5)×
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
| 7 |
| 6 |
| 1 |
| 6 |
点评:此题考查了有理数的混合运算,掌握混合运算的顺序和法则是解题的关键,注意结果的符号,是一道基础题.
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