题目内容
用简便算法计算:
(1)
×
+
÷
(2)
(3)
×
+
×0.6.
(1)
| 7 |
| 25 |
| 8 |
| 11 |
| 7 |
| 25 |
| 11 |
| 3 |
(2)
7-
| ||||
| 12 |
(3)
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 4 |
考点:运算定律与简便运算
专题:运算定律及简算
分析:(1)根据除以一个分数,等于乘这个分数的倒数,然后根据乘法分配律,提取
,计算即可;
(2)首先计算分子,根据减法的性质计算即可,然后除以分母,计算即可;
(3)0.6=
,然后根据乘法分配律,提取
.计算即可.
| 7 |
| 25 |
(2)首先计算分子,根据减法的性质计算即可,然后除以分母,计算即可;
(3)0.6=
| 3 |
| 5 |
| 3 |
| 4 |
解答:
解:(1)
×
+
÷
=
×
+
×
=
×(
+
)
=
×1
=
(2)
=[7-(
+
)]÷12
=(7-
]÷12
=
÷12
=
(3)
×
+
×0.6
=
×
+
×
=
×(
+
)
=
×1
=
| 7 |
| 25 |
| 8 |
| 11 |
| 7 |
| 25 |
| 11 |
| 3 |
=
| 7 |
| 25 |
| 8 |
| 11 |
| 7 |
| 25 |
| 3 |
| 11 |
=
| 7 |
| 25 |
| 8 |
| 11 |
| 3 |
| 11 |
=
| 7 |
| 25 |
=
| 7 |
| 25 |
(2)
7-
| ||||
| 12 |
=[7-(
| 3 |
| 12 |
| 5 |
| 12 |
=(7-
| 2 |
| 3 |
=
| 19 |
| 3 |
=
| 19 |
| 36 |
(3)
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 4 |
=
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 4 |
| 3 |
| 5 |
=
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 5 |
=
| 3 |
| 4 |
=
| 3 |
| 4 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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