题目内容
下列各题能简算的简算
|
|
1-(
| ||||||||||||||||||
|
|
|
分析:(1)按照从左向右的顺序进行计算;
(2)根据加法交换律进行简算;
(3)先算加法,再算减法;
(4)根据加法交换律进行简算;
(5)按照从左向右的顺序进行计算;
(6)根据加法交换律进行简算.
(2)根据加法交换律进行简算;
(3)先算加法,再算减法;
(4)根据加法交换律进行简算;
(5)按照从左向右的顺序进行计算;
(6)根据加法交换律进行简算.
解答:解:(1)
+
+
=
+
=2;
(2)
+
-
=
-
+
=0+
=
;
(3)1-(
+
)
=1-
=
;
(4)
-
+
=
+
-
=1-
=
;
(5)
+
-
=
-
=
;
(6)
+
+
=
+
+
=1+
=1
.
| 5 |
| 6 |
| 1 |
| 2 |
| 2 |
| 3 |
=
| 4 |
| 3 |
| 2 |
| 3 |
=2;
(2)
| 8 |
| 9 |
| 4 |
| 5 |
| 8 |
| 9 |
=
| 8 |
| 9 |
| 8 |
| 9 |
| 4 |
| 5 |
=0+
| 4 |
| 5 |
=
| 4 |
| 5 |
(3)1-(
| 1 |
| 6 |
| 1 |
| 3 |
=1-
| 1 |
| 2 |
=
| 1 |
| 2 |
(4)
| 2 |
| 3 |
| 1 |
| 6 |
| 1 |
| 3 |
=
| 2 |
| 3 |
| 1 |
| 3 |
| 1 |
| 6 |
=1-
| 1 |
| 6 |
=
| 5 |
| 6 |
(5)
| 2 |
| 7 |
| 5 |
| 6 |
| 1 |
| 2 |
=
| 47 |
| 42 |
| 1 |
| 2 |
=
| 13 |
| 21 |
(6)
| 1 |
| 5 |
| 3 |
| 8 |
| 4 |
| 5 |
=
| 1 |
| 5 |
| 4 |
| 5 |
| 3 |
| 8 |
=1+
| 3 |
| 8 |
=1
| 3 |
| 8 |
点评:考查了运算定律与简便运算,分数加减法的四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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