题目内容
计算(能简便计算的要用简便方法计算)
|
|
| ||||||||||||||||||||
|
|
|
考点:分数的四则混合运算,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)按分数四则混合运算的运算方法计算即可;
(2)根据减法的性质简算即可;
(3)(4)根据加法交换律和加法结合律简算即可;
(5)(6)按分数四则混合运算的运算方法计算即可.
(2)根据减法的性质简算即可;
(3)(4)根据加法交换律和加法结合律简算即可;
(5)(6)按分数四则混合运算的运算方法计算即可.
解答:
解:(1)
-(
-
)
=
-
=
(2)
-
-
=
-(
+
)
=
-1
=
(3)
+
+
=
+
+
=1+
=1
(4)
+
+
+
=(
+
)+(
+
)
=1+1
=2
(5)
+
-
=
-
=
(6)
-(
+
)
=
-
=
| 3 |
| 4 |
| 5 |
| 6 |
| 1 |
| 3 |
=
| 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 |
(4)
| 5 |
| 9 |
| 2 |
| 7 |
| 4 |
| 9 |
| 5 |
| 7 |
=(
| 5 |
| 9 |
| 4 |
| 9 |
| 2 |
| 7 |
| 5 |
| 7 |
=1+1
=2
(5)
| 5 |
| 9 |
| 2 |
| 3 |
| 2 |
| 7 |
=
| 11 |
| 9 |
| 2 |
| 7 |
=
| 59 |
| 63 |
(6)
| 4 |
| 5 |
| 1 |
| 6 |
| 3 |
| 7 |
=
| 4 |
| 5 |
| 25 |
| 42 |
=
| 43 |
| 210 |
点评:此题主要考查了分数四则混合运算的计算方法的运用,以及加法运算定律、减法的性质在分数四则混合运算中的运用.
练习册系列答案
相关题目