题目内容
计算下列各题
(1)
+
+
(2)
-(
-
)
(3)(4+
)-(
+
)
(1)
| 5 |
| 6 |
| 7 |
| 9 |
| 3 |
| 8 |
(2)
| 11 |
| 8 |
| 2 |
| 3 |
| 1 |
| 4 |
(3)(4+
| 2 |
| 7 |
| 9 |
| 14 |
| 1 |
| 2 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)按照从左向右是顺序进行计算;
(2)先算小括号里面的减法,再算括号外面的减法;
(3)先算括号里面的加法,再算减法.
(2)先算小括号里面的减法,再算括号外面的减法;
(3)先算括号里面的加法,再算减法.
解答:
解:(1)
+
+
=
+
=
;
(2)
-(
-
)
=
-
=
;
(3)(4+
)-(
+
)
=4
-1
=3
.
| 5 |
| 6 |
| 7 |
| 9 |
| 3 |
| 8 |
=
| 29 |
| 18 |
| 3 |
| 8 |
=
| 143 |
| 72 |
(2)
| 11 |
| 8 |
| 2 |
| 3 |
| 1 |
| 4 |
=
| 11 |
| 8 |
| 5 |
| 12 |
=
| 23 |
| 24 |
(3)(4+
| 2 |
| 7 |
| 9 |
| 14 |
| 1 |
| 2 |
=4
| 2 |
| 7 |
| 1 |
| 7 |
=3
| 1 |
| 7 |
点评:考查了分数四则混合运算,注意运算顺序,然后再进一步计算.
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