题目内容
脱式计算下列各题:(写出主要计算过程)
5-
÷
×
(
+
)×15×17
[
+(2-0.47)÷
]÷10.4.
5-
| 1 |
| 3 |
| 3 |
| 4 |
| 9 |
| 10 |
(
| 1 |
| 15 |
| 2 |
| 17 |
[
| 1 |
| 5 |
| 3 |
| 20 |
分析:(1)、(3)按照分数的四则混合运算的顺序进行计算.
(2)运用乘法的分配律进行计算,使计算更加简便.
(2)运用乘法的分配律进行计算,使计算更加简便.
解答:解:(1)5-
÷
×
,
=5-
×
×
,
=5-
,
=4
;
(2)(
+
)×15×17,
=
×15×17+15×17×
,
=17+30,
=47;
(3)[
+(2-0.47)÷
]÷10.4,
=[
+
×
]×
,
=[
+
]×
,
=
×
,
=1;
| 1 |
| 3 |
| 3 |
| 4 |
| 9 |
| 10 |
=5-
| 1 |
| 3 |
| 4 |
| 3 |
| 9 |
| 10 |
=5-
| 2 |
| 5 |
=4
| 3 |
| 5 |
(2)(
| 1 |
| 15 |
| 2 |
| 17 |
=
| 1 |
| 15 |
| 2 |
| 17 |
=17+30,
=47;
(3)[
| 1 |
| 5 |
| 3 |
| 20 |
=[
| 1 |
| 5 |
| 153 |
| 100 |
| 20 |
| 3 |
| 5 |
| 52 |
=[
| 1 |
| 5 |
| 51 |
| 5 |
| 5 |
| 52 |
=
| 52 |
| 5 |
| 5 |
| 52 |
=1;
点评:本题考查学生要认真观察题目中的数据,选用合适的运算定律进行解答题目.
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