题目内容
计算:
-
+1.9.
| 5 |
| 12 |
| 3 |
| 4 |
分析:先通分,把
化为
分母不变,分子相加、减;再加上1.9.
| 3 |
| 4 |
| 9 |
| 12 |
解答:解:
-
+1.9,
=
-
+1.9,
=1.9-
,
=
-
,
=
.
| 5 |
| 12 |
| 3 |
| 4 |
=
| 5 |
| 12 |
| 9 |
| 12 |
=1.9-
| 1 |
| 3 |
=
| 19 |
| 10 |
| 1 |
| 3 |
=
| 47 |
| 30 |
点评:本题主要考查了分数的加法和减法的计算方法.
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