题目内容
| 计算: (1)4
|
(2)1.75-
|
(3)3
|
分析:把分数化成小数或把小数化成分数,然后再进行计算.
解答:解:
(1)4
+1.235,
=4.125+1.235,
=5.36;
(2)1.75-
,
=1.75-0.25,
=1.5;
(3)3
-2.2,
=3
-2
,
=1
.
(1)4
| 1 |
| 8 |
=4.125+1.235,
=5.36;
(2)1.75-
| 1 |
| 4 |
=1.75-0.25,
=1.5;
(3)3
| 5 |
| 6 |
=3
| 5 |
| 6 |
| 1 |
| 5 |
=1
| 19 |
| 30 |
点评:主要是先化成同一种数,然后再进行计算.
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