题目内容
计算(能简便计算的要用简便方法计算)
- (
-
)=
-
-
=
+
+
=
| 3 |
| 4 |
| 5 |
| 6 |
| 1 |
| 3 |
| 5 |
| 3 |
| 2 |
| 7 |
| 5 |
| 7 |
| 4 |
| 9 |
| 6 |
| 7 |
| 5 |
| 9 |
考点:分数的加法和减法
专题:运算顺序及法则
分析:①首先计算括号内的,然后计算括号外的减法,分别通分计算即可;
②根据减法的性质简算即可;
③根据加法交换律和结合律即可得解.
②根据减法的性质简算即可;
③根据加法交换律和结合律即可得解.
解答:
解:①
- (
-
)
=
-(
-
)
=
-
=
②
-
-
=
-(
+
)
=
-1
=
③
+
+
=(
+
)+
=1+
=1
| 3 |
| 4 |
| 5 |
| 6 |
| 1 |
| 3 |
=
| 3 |
| 4 |
| 5 |
| 6 |
| 2 |
| 6 |
=
| 3 |
| 4 |
| 1 |
| 2 |
=
| 1 |
| 4 |
②
| 5 |
| 3 |
| 2 |
| 7 |
| 5 |
| 7 |
=
| 5 |
| 3 |
| 2 |
| 7 |
| 5 |
| 7 |
=
| 5 |
| 3 |
=
| 2 |
| 3 |
③
| 4 |
| 9 |
| 6 |
| 7 |
| 5 |
| 9 |
=(
| 4 |
| 9 |
| 5 |
| 9 |
| 6 |
| 7 |
=1+
| 6 |
| 7 |
=1
| 6 |
| 7 |
点评:认真分析题目中的数据,应用适当的运算定律来解决问题.
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