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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