题目内容
用你喜欢的方法算:
(1)
|
(2)
|
(3)
| ||||||||||||||||||||
(4)101×
|
(5)(
|
(6)
|
分析:(1)(3)(4)(5)根据乘法分配律进行简算;
(2)(6)根据乘法交换律和结合律进行简算.
(2)(6)根据乘法交换律和结合律进行简算.
解答:解:(1)
×
+
×
,
=
×(
+
),
=
;
(2)
×
×
,
=
×(
×
),
=
×
,
=
;
(3)
×(
-
),
=
×
-
×
,
=
-
,
=
;
(4)101×
-
,
=(101-1)×
=100×
,
=
;
(5)(
+
)×56,
=
×56+
×56,
=24+35,
=59;
(6)
×34×7×
,
=(
×7)×(34×
),
=1×4,
=4.
5 |
7 |
1 |
4 |
3 |
4 |
5 |
7 |
=
5 |
7 |
1 |
4 |
3 |
4 |
=
5 |
7 |
(2)
4 |
5 |
3 |
8 |
5 |
9 |
=
4 |
5 |
3 |
8 |
5 |
9 |
=
4 |
5 |
5 |
24 |
=
1 |
6 |
(3)
5 |
6 |
14 |
15 |
1 |
4 |
=
5 |
6 |
14 |
15 |
5 |
6 |
1 |
4 |
=
7 |
9 |
5 |
24 |
=
41 |
72 |
(4)101×
1 |
7 |
1 |
7 |
=(101-1)×
1 |
7 |
=100×
1 |
7 |
=
100 |
7 |
(5)(
3 |
7 |
5 |
8 |
=
3 |
7 |
5 |
8 |
=24+35,
=59;
(6)
1 |
7 |
2 |
17 |
=(
1 |
7 |
2 |
17 |
=1×4,
=4.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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