题目内容
计算下列各题,能简算的要简算.
5÷(
+
)×
(
-
+
)×48
÷9+
×
(
-
)×
+
.
5÷(
| 1 |
| 2 |
| 1 |
| 6 |
| 2 |
| 15 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 6 |
| 25 |
| 6 |
| 25 |
| 8 |
| 9 |
| 1 |
| 2 |
| 3 |
| 7 |
| 7 |
| 25 |
| 2 |
| 5 |
分析:(1)可据交换律进行简算;
(2)、(3)可据分配律进行简算;
(4)据四则混合运算法则计算即可.
(2)、(3)可据分配律进行简算;
(4)据四则混合运算法则计算即可.
解答:解:(1)5÷(
+
)×
=5×
÷(
+
),
=
÷(
+
),
=
×
,
=1;
(2)(
-
+
)×48
=
×48-
×48+
×48,
=24-16+12,
=20;
(3)
÷9+
×
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(4)(
-
)×
+
=
×
+
,
=
+
,
=
.
| 1 |
| 2 |
| 1 |
| 6 |
| 2 |
| 15 |
=5×
| 2 |
| 15 |
| 1 |
| 2 |
| 1 |
| 6 |
=
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
=
| 2 |
| 3 |
| 6 |
| 4 |
=1;
(2)(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=24-16+12,
=20;
(3)
| 6 |
| 25 |
| 6 |
| 25 |
| 8 |
| 9 |
=
| 6 |
| 25 |
| 1 |
| 9 |
| 6 |
| 25 |
| 8 |
| 9 |
=
| 6 |
| 25 |
| 1 |
| 9 |
| 8 |
| 9 |
=
| 6 |
| 25 |
=
| 6 |
| 25 |
(4)(
| 1 |
| 2 |
| 3 |
| 7 |
| 7 |
| 25 |
| 2 |
| 5 |
=
| 1 |
| 14 |
| 7 |
| 25 |
| 2 |
| 5 |
=
| 1 |
| 50 |
| 2 |
| 5 |
=
| 21 |
| 50 |
点评:完成本题要认真分析式中数据,找出数据之间的内在联系,然后进行简算.
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