题目内容
计算下面各题.
|
| ||||||||||
60×(
|
9.6÷3.2+5.2×0.4. |
分析:(1)
÷[(
×
)×
],根据分数四则混合运算的顺序,按照分数四则运算的计算法则脱式计算;
(2)
×39+61÷25,把除数转化为乘它的倒数,再运用乘法分配律进行简算;
(3)60×(
+
+
),运用乘法分配律进行简算;
(4)9.6÷3.2+5.2×0.4.根据小数四则混合运算的顺序,按照小数四则运算的计算法则脱式计算;
3 |
8 |
1 |
5 |
1 |
4 |
3 |
8 |
(2)
1 |
25 |
(3)60×(
1 |
4 |
1 |
3 |
1 |
2 |
(4)9.6÷3.2+5.2×0.4.根据小数四则混合运算的顺序,按照小数四则运算的计算法则脱式计算;
解答:解:(1)
÷[(
×
)×
],
=
÷[
×
],
÷
,
=
×
,
=20;
(2)
×39+61÷25,
=
×39+61×
,
=
×(39+61),
=
×100,
=4;
(3)60×(
+
+
),
=60×
+60×
+60×
,
=15+20+30,
=65;
(4)9.6÷3.2+5.2×0.4.
=3+2.08,
=5.08.
3 |
8 |
1 |
5 |
1 |
4 |
3 |
8 |
=
3 |
8 |
1 |
20 |
3 |
8 |
3 |
8 |
3 |
160 |
=
3 |
8 |
160 |
3 |
=20;
(2)
1 |
25 |
=
1 |
25 |
1 |
25 |
=
1 |
25 |
=
1 |
25 |
=4;
(3)60×(
1 |
4 |
1 |
3 |
1 |
2 |
=60×
1 |
4 |
1 |
3 |
1 |
2 |
=15+20+30,
=65;
(4)9.6÷3.2+5.2×0.4.
=3+2.08,
=5.08.
点评:此题考查的目的是掌握小数、分数四则混合运算的顺序及它们的计算法则,并且能够灵活选择简便方法进行计算.
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