题目内容
用简便方法计算.(写出主要过程)
3.625+2
+4
+0.375
×7
+0.25×3
.
3.625+2
| 1 |
| 13 |
| 12 |
| 13 |
| 1 |
| 4 |
| 5 |
| 7 |
| 2 |
| 7 |
分析:(1)运用加法交换律与结合律简算;
(2)把
化为0.25,运用乘法分配律简算.
(2)把
| 1 |
| 4 |
解答:解:(1)3.625+2
+4
+0.375,
=(3.625+0.375)+(2
+4
),
=4+7,
=11;
(2)
×7
+0.25×3
,
=0.25×7
+0.25×3
,
=0.25×(7
+3
),
=0.25×(10+1),
=2.5+0.25,
=2.75.
| 1 |
| 13 |
| 12 |
| 13 |
=(3.625+0.375)+(2
| 1 |
| 13 |
| 12 |
| 13 |
=4+7,
=11;
(2)
| 1 |
| 4 |
| 5 |
| 7 |
| 2 |
| 7 |
=0.25×7
| 5 |
| 7 |
| 2 |
| 7 |
=0.25×(7
| 5 |
| 7 |
| 2 |
| 7 |
=0.25×(10+1),
=2.5+0.25,
=2.75.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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