题目内容
计算:
(1)
+(-
)+
+(-
)= .
(2)(1
)+(-
)+(-1
)+3
= .
(1)
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
(2)(1
| 3 |
| 4 |
| 5 |
| 6 |
| 1 |
| 4 |
| 1 |
| 3 |
考点:正、负数的运算
专题:运算顺序及法则
分析:首先把正数和负数分别相加,然后计算出结果即可.
解答:
解:(1)
+(-
)+
+(-
)
=(
+
)-(
+
)
=
-
=
;
(2)(1
)+(-
)+(-1
)+3
=(1
+3
)-(
+1
)
=5
-2
=3.
故答案为:
,3.
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
=(
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 5 |
=
| 3 |
| 4 |
| 8 |
| 15 |
=
| 13 |
| 60 |
(2)(1
| 3 |
| 4 |
| 5 |
| 6 |
| 1 |
| 4 |
| 1 |
| 3 |
=(1
| 3 |
| 4 |
| 1 |
| 3 |
| 5 |
| 6 |
| 1 |
| 4 |
=5
| 1 |
| 12 |
| 1 |
| 12 |
=3.
故答案为:
| 13 |
| 60 |
点评:本题考查了有理数的加减混合运算,确定运算顺序是解答本题关键.
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