题目内容
计算:
÷
+
×
.
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
分析:把除法改为乘法,进一步利用乘法分配律简算即可.
解答:解:
÷
+
×
=
×
+
×
=(
+
)×
=
.
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
=
| 7 |
| 9 |
| 5 |
| 11 |
| 2 |
| 9 |
| 5 |
| 11 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 11 |
=
| 5 |
| 11 |
点评:抓住数字和运算符号的特点,选择合理的运算定律简算.
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