题目内容
计算下面各题,能简便的简便算.
15÷
+
×8
×
÷
÷23+
×
×
+
×
.
15÷
| 5 |
| 9 |
| 1 |
| 6 |
| 8 |
| 9 |
| 3 |
| 4 |
| 8 |
| 15 |
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
| 2 |
| 7 |
| 8 |
| 9 |
| 5 |
| 7 |
| 8 |
| 9 |
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)按照先同时计算除法和乘法,再算加法顺序计算解答,
(2)按照从左到右顺序计算解答,
(3)(4)运用乘法分配律解答.
(2)按照从左到右顺序计算解答,
(3)(4)运用乘法分配律解答.
解答:
解:(1)15÷
+
×8
=27+
=28
;
(2)
×
÷
=
÷
=1
;
(3)
÷23+
×
=
×(
+
)
=
×1
=
;
(4)
×
+
×
=(
+
)×
=1×
=
.
| 5 |
| 9 |
| 1 |
| 6 |
=27+
| 4 |
| 3 |
=28
| 1 |
| 3 |
(2)
| 8 |
| 9 |
| 3 |
| 4 |
| 8 |
| 15 |
=
| 2 |
| 3 |
| 8 |
| 15 |
=1
| 1 |
| 4 |
(3)
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
=
| 1 |
| 23 |
| 8 |
| 17 |
| 9 |
| 17 |
=
| 1 |
| 23 |
=
| 1 |
| 23 |
(4)
| 2 |
| 7 |
| 8 |
| 9 |
| 5 |
| 7 |
| 8 |
| 9 |
=(
| 2 |
| 7 |
| 5 |
| 7 |
| 8 |
| 9 |
=1×
| 8 |
| 9 |
=
| 8 |
| 9 |
点评:(1)依据四则运算计算方法正确进行计算,(2)正确运用乘法分配律解决问题,是本题考查知识点.
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