题目内容
计算:|
-
|-|
-
|+|
-
|= .
| 2 |
| 2 |
| 7 |
| 8 |
| 3 |
| 5 |
| 4 |
| 7 |
| 3 |
| 8 |
| 3 |
| 7 |
考点:有理数的加减混合运算,绝对值
专题:
分析:可以判断绝对值里面数的正负,然后去掉绝对值号,再利用运算律计算即可.
解答:解:|
-
|-|
-
|+|
-
|
=1-
-(
-
)-(
-
)
=1-
-
+
-
+
=1+
+
-
-
-
=2-
-
=
-
=
.
故答案为:
.
| 2 |
| 2 |
| 7 |
| 8 |
| 3 |
| 5 |
| 4 |
| 7 |
| 3 |
| 8 |
| 3 |
| 7 |
=1-
| 7 |
| 8 |
| 3 |
| 5 |
| 4 |
| 7 |
| 3 |
| 8 |
| 3 |
| 7 |
=1-
| 7 |
| 8 |
| 3 |
| 5 |
| 4 |
| 7 |
| 3 |
| 8 |
| 3 |
| 7 |
=1+
| 4 |
| 7 |
| 3 |
| 7 |
| 7 |
| 8 |
| 3 |
| 5 |
| 3 |
| 8 |
=2-
| 10 |
| 8 |
| 3 |
| 5 |
=
| 3 |
| 4 |
| 3 |
| 5 |
=
| 3 |
| 20 |
故答案为:
| 3 |
| 20 |
点评:本题主要考查有理数的加减混合运算,解题的关键是把绝对值号去掉.
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