题目内容
(2012?万秀区模拟)
|
73÷
|
1÷(15-
|
|
分析:(1)、(3)、(4)根据四则混合运算的运算顺序计算即可.
(2)根据数值的特点运用乘法分配律进行计算较为简便.
(2)根据数值的特点运用乘法分配律进行计算较为简便.
解答:解:(1)
+
÷
,
=
+
×
,
=
+
,
=
;
(2)73÷
-37×
,
=73×
-37×
,
=(73-37)×
,
=36×
,
=84;
(3)1÷(15-
-
),
=1÷(15-5)
=1÷10,
=0.1;
(4)
÷[(
+
)×
],
=
÷[
×
],
=
÷
,
=
×
,
=
.
| 5 |
| 8 |
| 3 |
| 8 |
| 2 |
| 3 |
=
| 5 |
| 8 |
| 3 |
| 8 |
| 3 |
| 2 |
=
| 10 |
| 16 |
| 9 |
| 16 |
=
| 19 |
| 16 |
(2)73÷
| 3 |
| 7 |
| 7 |
| 3 |
=73×
| 7 |
| 3 |
| 7 |
| 3 |
=(73-37)×
| 7 |
| 3 |
=36×
| 7 |
| 3 |
=84;
(3)1÷(15-
| 12 |
| 5 |
| 13 |
| 5 |
=1÷(15-5)
=1÷10,
=0.1;
(4)
| 3 |
| 5 |
| 7 |
| 9 |
| 1 |
| 3 |
| 3 |
| 2 |
=
| 3 |
| 5 |
| 10 |
| 9 |
| 3 |
| 2 |
=
| 3 |
| 5 |
| 5 |
| 3 |
=
| 3 |
| 5 |
| 3 |
| 5 |
=
| 9 |
| 25 |
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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