题目内容
脱式计算,能简算的要简算
|
7.5×
| ||||||||||||
|
24÷(
|
分析:(1)(3)(4)运用分数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即可.
(2)运用乘法的分配律进行计算即可.
解答:解:(1)
÷
×
,
=
×
×
,
=
;
(2)7.5×
+7.5×
,
=7.5×(
+
),
=7.5×1,
=7.5;
(3)
+
×
-
,
=
+
-
,
=
-
,
=
;
(4)24÷(
÷
),
=24÷(
×
),
=24÷
,
=24×
,
=28.8.
| 3 |
| 7 |
| 5 |
| 7 |
| 7 |
| 15 |
=
| 3 |
| 7 |
| 7 |
| 5 |
| 7 |
| 15 |
=
| 7 |
| 25 |
(2)7.5×
| 2 |
| 3 |
| 1 |
| 3 |
=7.5×(
| 1 |
| 3 |
| 2 |
| 3 |
=7.5×1,
=7.5;
(3)
| 2 |
| 7 |
| 5 |
| 7 |
| 1 |
| 5 |
| 1 |
| 14 |
=
| 2 |
| 7 |
| 1 |
| 7 |
| 1 |
| 14 |
=
| 6 |
| 14 |
| 1 |
| 14 |
=
| 5 |
| 14 |
(4)24÷(
| 5 |
| 9 |
| 2 |
| 3 |
=24÷(
| 5 |
| 9 |
| 3 |
| 2 |
=24÷
| 5 |
| 6 |
=24×
| 6 |
| 5 |
=28.8.
点评:在计算的时候一定要认真按照分数的四则混合运算的顺序进行计算并灵活的运用运算定律.
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