题目内容
用简便方法计算.
|
(
|
|
分析:(1)(2)运用乘法分配律简算;
(3)把除法变为乘法,发现减号前后算式相等,故结果为0.
(3)把除法变为乘法,发现减号前后算式相等,故结果为0.
解答:解:(1)
×9+
=
×(9+1)
=
×10
=
(2)(
-
+
)×12
=
×12-
×12+
×12
=4-2+3
=5
(3)
×12-
÷
=
×12-
×12
=0
5 |
6 |
5 |
6 |
=
5 |
6 |
=
5 |
6 |
=
25 |
3 |
(2)(
1 |
3 |
1 |
6 |
1 |
4 |
=
1 |
3 |
1 |
6 |
1 |
4 |
=4-2+3
=5
(3)
3 |
5 |
3 |
5 |
1 |
12 |
=
3 |
5 |
3 |
5 |
=0
点评:认真分析数据,采取灵活的方法简算.
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