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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