题目内容
用简便方法计算:
(
+
-
)×24;
×6+9÷
-
.
(
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| 2 |
| 2 |
| 3 |
| 1 |
| 4 |
| 6 |
| 7 |
| 7 |
| 6 |
| 6 |
| 7 |
考点:分数的简便计算
专题:运算定律及简算
分析:(1)运用乘法分配律简算;
(2)把除法变为乘法,运用乘法分配律简算.
(2)把除法变为乘法,运用乘法分配律简算.
解答:
解:(
+
-
)×24
=
×24+
×24-
×24
=12+16-6
=22
(2)
×6+9÷
-
=
×6+9×
-
=
×(6+9-1)
=
×14
=12
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 4 |
=12+16-6
=22
(2)
| 6 |
| 7 |
| 7 |
| 6 |
| 6 |
| 7 |
=
| 6 |
| 7 |
| 6 |
| 7 |
| 6 |
| 7 |
=
| 6 |
| 7 |
=
| 6 |
| 7 |
=12
点评:此题主要考查了学生运用乘法分配律进行简算的能力.
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