题目内容
用你喜欢的方法计算.
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24×(
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考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(4)运用乘法分配律简算.
(2)先算乘法,再算加法.
(3)先算括号内的,再算括号外的.
(5)从左往右依次运算,注意约分计算.
(6)把除法变为乘法,运用乘法分配律简算.
(2)先算乘法,再算加法.
(3)先算括号内的,再算括号外的.
(5)从左往右依次运算,注意约分计算.
(6)把除法变为乘法,运用乘法分配律简算.
解答:
解:(1)
×
+
×
=(
+
)×
=1×
=
(2)
+
×
=
+
=
(3)
÷(
÷4)
=
÷
=
×6
=
(4)24×(
-
)
=24×
-
×24
=14-4
=10
(5)
×
÷
=
×
=
(6)
÷9+
×
=
×
+
×
=(
+
)×
=1×
=
| 7 |
| 16 |
| 2 |
| 7 |
| 2 |
| 7 |
| 9 |
| 16 |
=(
| 7 |
| 16 |
| 9 |
| 16 |
| 2 |
| 7 |
=1×
| 2 |
| 7 |
=
| 2 |
| 7 |
(2)
| 3 |
| 4 |
| 1 |
| 8 |
| 2 |
| 3 |
=
| 3 |
| 4 |
| 1 |
| 12 |
=
| 5 |
| 6 |
(3)
| 3 |
| 5 |
| 2 |
| 3 |
=
| 3 |
| 5 |
| 1 |
| 6 |
=
| 3 |
| 5 |
=
| 18 |
| 5 |
(4)24×(
| 7 |
| 12 |
| 1 |
| 6 |
=24×
| 7 |
| 12 |
| 1 |
| 6 |
=14-4
=10
(5)
| 7 |
| 12 |
| 3 |
| 7 |
| 5 |
| 6 |
=
| 1 |
| 4 |
| 6 |
| 5 |
=
| 3 |
| 10 |
(6)
| 11 |
| 18 |
| 7 |
| 18 |
| 1 |
| 9 |
=
| 11 |
| 18 |
| 1 |
| 9 |
| 7 |
| 18 |
| 1 |
| 9 |
=(
| 11 |
| 18 |
| 7 |
| 18 |
| 1 |
| 9 |
=1×
| 1 |
| 9 |
=
| 1 |
| 9 |
点评:此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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