题目内容
(2012?宿迁)用你喜欢的方法计算
×
+
÷4
3.8×999+3.8
(
+
-
)÷
.
| 1 |
| 4 |
| 3 |
| 7 |
| 4 |
| 7 |
3.8×999+3.8
(
| 1 |
| 2 |
| 1 |
| 8 |
| 1 |
| 6 |
| 1 |
| 48 |
分析:(1)把÷4化成×
然后利用乘法分配律简算;
(2)直接利用乘法分配律简算;
(3)把÷
化成×48,然后利用乘法分配律简算.
| 1 |
| 4 |
(2)直接利用乘法分配律简算;
(3)把÷
| 1 |
| 48 |
解答:解:
×
+
÷4,
=
×(
+
),
=
×1,
=
;
3.8×999+3.8,
=3.8×(999+1),
=3.8×1000,
=3800;
(
+
-
)÷
,
=
×48+
×48-
×48,
=24+6-8,
=22.
| 1 |
| 4 |
| 3 |
| 7 |
| 4 |
| 7 |
=
| 1 |
| 4 |
| 3 |
| 7 |
| 4 |
| 7 |
=
| 1 |
| 4 |
=
| 1 |
| 4 |
3.8×999+3.8,
=3.8×(999+1),
=3.8×1000,
=3800;
(
| 1 |
| 2 |
| 1 |
| 8 |
| 1 |
| 6 |
| 1 |
| 48 |
=
| 1 |
| 2 |
| 1 |
| 8 |
| 1 |
| 6 |
=24+6-8,
=22.
点评:本题主要利用乘法分配律进行简算.
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