题目内容
（2010?尤溪县模拟）
|
2.8÷0.7= |
| ||||||
7-3
|
(
|
0.04÷0.09= |
分析：利用四则运算的计算方法解答即可并能使用简便算法的进行计算．
解答：解：①
+0.375
=0.125+0.375
=0.5；
②2.8÷0.7=4；
③
×0.8
=
×
=
；
④7-3
=3
；
⑤（
-
）×21
=
×21-
×21
=7-3
=4；
⑥0.04÷0.09
=
÷
=
×
=
．
| 1 |
| 8 |
=0.125+0.375
=0.5；
②2.8÷0.7=4；
③
| 3 |
| 4 |
=
| 3 |
| 4 |
| 4 |
| 5 |
=
| 3 |
| 5 |
④7-3
| 2 |
| 5 |
| 3 |
| 5 |
⑤（
| 1 |
| 3 |
| 1 |
| 7 |
=
| 1 |
| 3 |
| 1 |
| 7 |
=7-3
=4；
⑥0.04÷0.09
=
| 1 |
| 25 |
| 9 |
| 100 |
=
| 1 |
| 25 |
| 100 |
| 9 |
=
| 4 |
| 9 |
点评：计算中可以根据数的特点灵活选择适当的方法．
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