题目内容
简便计算
3-
-
+
+
+
-
+
-
.
3-
| 1 |
| 4 |
| 3 |
| 4 |
| 2 |
| 5 |
| 1 |
| 3 |
| 3 |
| 5 |
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 6 |
| 1 |
| 4 |
| 5 |
| 6 |
考点:分数的简便计算
专题:运算定律及简算
分析:(1)运用减法的性质简算.
(2)(3)运用加法交换律与结合律简算.
(2)(3)运用加法交换律与结合律简算.
解答:
解:(1)3-
-
=3-(
+
)
=3-1
=2
(2)
+
+
+
=(
+
)+(
+
)
=1+1
=2
(3)
-
+
-
=(
+
)-(
+
)
=1-1
=0
| 1 |
| 4 |
| 3 |
| 4 |
=3-(
| 1 |
| 4 |
| 3 |
| 4 |
=3-1
=2
(2)
| 2 |
| 5 |
| 1 |
| 3 |
| 3 |
| 5 |
| 2 |
| 3 |
=(
| 2 |
| 5 |
| 3 |
| 5 |
| 1 |
| 3 |
| 2 |
| 3 |
=1+1
=2
(3)
| 3 |
| 4 |
| 1 |
| 6 |
| 1 |
| 4 |
| 5 |
| 6 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 6 |
| 5 |
| 6 |
=1-1
=0
点评:仔细分析数据,应用运算定律进行简便计算.
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