题目内容
简便计算.
+
+
+
16-
-
-
+
-
.
| 7 |
| 6 |
| 3 |
| 7 |
| 5 |
| 6 |
| 4 |
| 7 |
16-
| 9 |
| 4 |
| 5 |
| 4 |
| 7 |
| 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)运用加法交换律和结合律简算;
(2)根据减法的性质简算;
(3)运用加法交换律和结合律,以及减法的性质简算.
(2)根据减法的性质简算;
(3)运用加法交换律和结合律,以及减法的性质简算.
解答:
解:(1)
+
+
+
=(
+
)+(
+
)
=2+1
=3;
(2)16-
-
=16-(
+
)
=16-3
=12
;
(3)
-
+
-
=(
+
)-(
+
)
=2-1
=1.
| 7 |
| 6 |
| 3 |
| 7 |
| 5 |
| 6 |
| 4 |
| 7 |
=(
| 7 |
| 6 |
| 5 |
| 6 |
| 3 |
| 7 |
| 4 |
| 7 |
=2+1
=3;
(2)16-
| 9 |
| 4 |
| 5 |
| 4 |
=16-(
| 9 |
| 4 |
| 5 |
| 4 |
=16-3
| 1 |
| 2 |
=12
| 1 |
| 2 |
(3)
| 7 |
| 4 |
| 1 |
| 6 |
| 1 |
| 4 |
| 5 |
| 6 |
=(
| 7 |
| 4 |
| 1 |
| 4 |
| 1 |
| 6 |
| 5 |
| 6 |
=2-1
=1.
点评:本题考查了基本的分数的加减混合运算,要注意分析数据,选择合适的简算方法简算.
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