题目内容
计算:
×
+
×
+
.
| 5 |
| 8 |
| 3 |
| 4 |
| 1 |
| 4 |
| 5 |
| 8 |
| 5 |
| 8 |
分析:通过观察,此题可运用乘法分配律简算.
解答:解:
×
+
×
+
,
=
×(
+
+1),
=
×2,
=
.
| 5 |
| 8 |
| 3 |
| 4 |
| 1 |
| 4 |
| 5 |
| 8 |
| 5 |
| 8 |
=
| 5 |
| 8 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 5 |
| 8 |
=
| 5 |
| 4 |
点评:仔细观察,运用所学的运算定律进行简算.
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