题目内容
脱式计算.
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分析:(1)先算加法,再算除法;
(2)、(3)、(4)按照从左向右的顺序进行计算.
(2)、(3)、(4)按照从左向右的顺序进行计算.
解答:解:(1)
÷(
+
)
=
÷
=
;
(2)
÷
×
=
×
=
;
(3)
÷0.2×
=4×
=
;
(4)
÷
÷
=
÷
=
.
| 23 |
| 25 |
| 3 |
| 4 |
| 2 |
| 5 |
=
| 23 |
| 25 |
| 23 |
| 20 |
=
| 4 |
| 5 |
(2)
| 3 |
| 10 |
| 2 |
| 5 |
| 9 |
| 11 |
=
| 3 |
| 4 |
| 9 |
| 11 |
=
| 27 |
| 44 |
(3)
| 4 |
| 5 |
| 5 |
| 6 |
=4×
| 5 |
| 6 |
=
| 10 |
| 3 |
(4)
| 5 |
| 7 |
| 1 |
| 2 |
| 5 |
| 6 |
=
| 10 |
| 7 |
| 5 |
| 6 |
=
| 12 |
| 7 |
点评:考查了分数和小数四则混合运算.注意运算顺序和运算法则,然后再进一步计算.
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