题目内容
计算.
1-
-
;
+
+
.
1-
| 2 |
| 7 |
| 3 |
| 7 |
| 1 |
| 2 |
| 2 |
| 5 |
| 1 |
| 3 |
分析:(1)根据减法的性质进行简算;
(2)按照从左向右的顺序进行计算.
(2)按照从左向右的顺序进行计算.
解答:解:(1)1-
-
=1-(
+
)
=1-
=
;
(2)
+
+
=
+
=
.
| 2 |
| 7 |
| 3 |
| 7 |
=1-(
| 2 |
| 7 |
| 3 |
| 7 |
=1-
| 5 |
| 7 |
=
| 2 |
| 7 |
(2)
| 1 |
| 2 |
| 2 |
| 5 |
| 1 |
| 3 |
=
| 9 |
| 10 |
| 1 |
| 3 |
=
| 37 |
| 30 |
点评:此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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