题目内容
用你喜欢的方法来计算.
+
+
6-(
-
)
-
+
.
| 3 |
| 11 |
| 5 |
| 9 |
| 8 |
| 11 |
6-(
| 3 |
| 4 |
| 2 |
| 5 |
| 5 |
| 8 |
| 2 |
| 5 |
| 3 |
| 8 |
分析:(1)根据加法交换律进行计算;
(2)先算小括号里面的减法,再算括号外面的减法;
(3)根据加法交换律进行计算.
(2)先算小括号里面的减法,再算括号外面的减法;
(3)根据加法交换律进行计算.
解答:解:
(1)
+
+
,
=
+
+
,
=1+
,
=1
;
(2)6-(
-
),
=6-
,
=5
;
(3)
-
+
,
=
+
-
,
=1-
,
=
.
(1)
| 3 |
| 11 |
| 5 |
| 9 |
| 8 |
| 11 |
=
| 3 |
| 11 |
| 8 |
| 11 |
| 5 |
| 9 |
=1+
| 5 |
| 9 |
=1
| 5 |
| 9 |
(2)6-(
| 3 |
| 4 |
| 2 |
| 5 |
=6-
| 7 |
| 20 |
=5
| 13 |
| 20 |
(3)
| 5 |
| 8 |
| 2 |
| 5 |
| 3 |
| 8 |
=
| 5 |
| 8 |
| 3 |
| 8 |
| 2 |
| 5 |
=1-
| 2 |
| 5 |
=
| 3 |
| 5 |
点评:考查了运算定律与简便运算,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律简便计算.
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