题目内容
用简便方法计算.
24×(
-
-
)
+
×
+
.
24×(
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 8 |
| 5 |
| 14 |
| 2 |
| 3 |
| 5 |
| 6 |
| 4 |
| 9 |
分析:(1)根据数字特点,因为24能与括号内的各分数中的分母约分,运用乘法分配律简算;
(2)先求出
×
的结果为
,然后与
结合,计算即可.
(2)先求出
| 2 |
| 3 |
| 5 |
| 6 |
| 5 |
| 9 |
| 4 |
| 9 |
解答:解:(1)24×(
-
-
),
=24×
-24×
-24×
,
=8-4-3,
=1;
(2)
+
×
+
,
=
+
+
,
=
+(
+
),
=
+1,
=1
.
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 8 |
=24×
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 8 |
=8-4-3,
=1;
(2)
| 5 |
| 14 |
| 2 |
| 3 |
| 5 |
| 6 |
| 4 |
| 9 |
=
| 5 |
| 14 |
| 5 |
| 9 |
| 4 |
| 9 |
=
| 5 |
| 14 |
| 5 |
| 9 |
| 4 |
| 9 |
=
| 5 |
| 14 |
=1
| 5 |
| 14 |
点评:此题考查了学生运用运算定律进行简算的能力.
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