题目内容
脱式计算.
+
÷
2-
×
.
| 3 |
| 4 |
| 3 |
| 8 |
| 3 |
| 4 |
| 8 |
| 15 |
| 1 |
| 4 |
分析:(1)先算除法,把除法改为乘法,约分计算,再算加法;
(2)先算乘法,注意约分,再算减法.
(2)先算乘法,注意约分,再算减法.
解答:解:(1)
+
÷
,
=
+
×
,
=
+
,
=
;
(2)2-
×
,
=2-
,
=
.
| 3 |
| 4 |
| 3 |
| 8 |
| 3 |
| 4 |
=
| 3 |
| 4 |
| 3 |
| 8 |
| 4 |
| 3 |
=
| 3 |
| 4 |
| 1 |
| 2 |
=
| 5 |
| 4 |
(2)2-
| 8 |
| 15 |
| 1 |
| 4 |
=2-
| 2 |
| 15 |
=
| 28 |
| 15 |
点评:本题考查了学生通过约分对分数四则混合运题目进行简算的能力.
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