题目内容
选择合适的方法计算.
| 4.96-(1.3+2.96) | 1
|
5600÷25÷8 |
|
分析:(1)根据减法的性质解答,
(2)先把除法转化成乘法,再按乘法分配律进行计算,
(3)根据除法的性质计算,
(4)先根据分数乘法的计算方法变形,再根据乘法分配律进行计算.
(2)先把除法转化成乘法,再按乘法分配律进行计算,
(3)根据除法的性质计算,
(4)先根据分数乘法的计算方法变形,再根据乘法分配律进行计算.
解答:解:(1)4.96-(1.3+2.96),
=4.96-1.3-2.96,
=0.7;
(2)1
÷
-
×2
,
=1
×2
-
×2
,
=(1
-
)×2
,
=
×
,
=
;
(3)5600÷25÷8,
=5000÷(25×8),
=5000÷200,
=25;
(4)
×
+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
=4.96-1.3-2.96,
=0.7;
(2)1
| 3 |
| 4 |
| 3 |
| 7 |
| 1 |
| 4 |
| 1 |
| 3 |
=1
| 3 |
| 4 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 3 |
=(1
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 3 |
=
| 3 |
| 2 |
| 7 |
| 3 |
=
| 7 |
| 2 |
(3)5600÷25÷8,
=5000÷(25×8),
=5000÷200,
=25;
(4)
| 4 |
| 11 |
| 3 |
| 5 |
| 8 |
| 11 |
| 4 |
| 5 |
=
| 3 |
| 11 |
| 4 |
| 5 |
| 8 |
| 11 |
| 4 |
| 5 |
=(
| 3 |
| 11 |
| 8 |
| 11 |
| 4 |
| 5 |
=1×
| 4 |
| 5 |
=
| 4 |
| 5 |
点评:本题考查了学生在四则运算中灵活运用简便算法进行计算的能力,注意计算结果的准确性.
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