题目内容
| 计算下面各题. (1)2-
| (2)
| (3)15-5÷12-
| ||||||||||||||||||||
(4)
| (5)
| (6)
|
考点:分数的加法和减法,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)(3)根据减法的性质简算;
(2)(3)(4)(6)根据加法的交换律与结合律简算;
(5)按从左到右的运算顺序计算即可.
(2)(3)(4)(6)根据加法的交换律与结合律简算;
(5)按从左到右的运算顺序计算即可.
解答:
解:(1)2-
-
-
=2-(
+
+
)
=2-1
=
(2)
+
+
=
+
+
=1
(3)15-5÷12-
=15-(5÷12+
)
=15-1
=14
(4)
+
+
+
=(
+
)+(
+
)
=1+1
=2
(5)
+
+
=1+
=1
(6)
+
-
=
-
+
=
+
=1
| 1 |
| 4 |
| 1 |
| 3 |
| 3 |
| 4 |
=2-(
| 1 |
| 4 |
| 1 |
| 3 |
| 3 |
| 4 |
=2-1
| 1 |
| 3 |
=
| 2 |
| 3 |
(2)
| 4 |
| 5 |
| 5 |
| 8 |
| 1 |
| 5 |
=
| 4 |
| 5 |
| 1 |
| 5 |
| 5 |
| 8 |
=1
| 5 |
| 8 |
(3)15-5÷12-
| 7 |
| 12 |
=15-(5÷12+
| 7 |
| 12 |
=15-1
=14
(4)
| 1 |
| 6 |
| 5 |
| 7 |
| 5 |
| 6 |
| 5 |
| 13 |
=(
| 1 |
| 6 |
| 5 |
| 6 |
| 5 |
| 13 |
| 5 |
| 7 |
=1+1
| 9 |
| 91 |
=2
| 9 |
| 91 |
(5)
| 5 |
| 13 |
| 5 |
| 13 |
| 2 |
| 7 |
=1+
| 2 |
| 7 |
=1
| 2 |
| 7 |
(6)
| 7 |
| 9 |
| 2 |
| 3 |
| 4 |
| 9 |
=
| 7 |
| 9 |
| 4 |
| 9 |
| 2 |
| 3 |
=
| 1 |
| 3 |
| 2 |
| 3 |
=1
点评:本题考查了分数相加减的计算法则的掌握情况.
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