题目内容
用你喜欢的方法算:
|
|
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|
(
|
27×
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101×
|
|
|
分析:(1)、(4)、(6)根据四则混合运算的运算顺序计算即可.
(2)、(5、)(7)、(8)据乘法分配律进行计算即可.
(3)据加法的交换律及结合律进行计算即可.
(9)据乘法交换律及结合律进行计算即可.
(2)、(5、)(7)、(8)据乘法分配律进行计算即可.
(3)据加法的交换律及结合律进行计算即可.
(9)据乘法交换律及结合律进行计算即可.
解答:解:(1)
+
×
,
=
+
,
=
;
(2)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)
+
+
+
,
=(
+
)+(
+
),
=1
;
(4)
×
×
,
=
×
,
=
;
(5)(
+
)×20,
=20×
+
×20,
=5+4,
=9;
(6)27×
-11,
=15-11,
=4;
(7)101×
-
,
=(101-1)×
,
=100×
,
=14
;
(8)
×48,
=
×(47+1),
=
×47+
×1,
=6+
,
=6
;
(9)
×34×7×
,
=(
×7)×(34×
),
=1×4,
=4.
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 3 |
=
| 1 |
| 4 |
| 1 |
| 4 |
=
| 1 |
| 2 |
(2)
| 5 |
| 7 |
| 1 |
| 4 |
| 3 |
| 4 |
| 5 |
| 7 |
=
| 5 |
| 7 |
| 1 |
| 4 |
| 3 |
| 4 |
=
| 5 |
| 7 |
=
| 5 |
| 7 |
(3)
| 1 |
| 3 |
| 4 |
| 7 |
| 2 |
| 3 |
| 1 |
| 7 |
=(
| 1 |
| 3 |
| 2 |
| 3 |
| 4 |
| 7 |
| 1 |
| 7 |
=1
| 5 |
| 7 |
(4)
| 4 |
| 5 |
| 3 |
| 8 |
| 5 |
| 9 |
=
| 3 |
| 10 |
| 5 |
| 9 |
=
| 1 |
| 6 |
(5)(
| 1 |
| 4 |
| 1 |
| 5 |
=20×
| 1 |
| 4 |
| 1 |
| 5 |
=5+4,
=9;
(6)27×
| 5 |
| 9 |
=15-11,
=4;
(7)101×
| 1 |
| 7 |
| 1 |
| 7 |
=(101-1)×
| 1 |
| 7 |
=100×
| 1 |
| 7 |
=14
| 2 |
| 7 |
(8)
| 6 |
| 47 |
=
| 6 |
| 47 |
=
| 6 |
| 47 |
| 6 |
| 47 |
=6+
| 6 |
| 47 |
=6
| 6 |
| 47 |
(9)
| 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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