题目内容
4
+4.5×2
+
÷
．
| 1 |
| 2 |
| 7 |
| 8 |
| 1 |
| 8 |
| 2 |
| 9 |
分析：先把除法变成乘法，然后运用乘法分配律简算．
解答：解：4
+4.5×2
+
÷
，
=4
+4
×2
+
×4
，
=4
×（1+2
+
），
=4
×4，
=18．
| 1 |
| 2 |
| 7 |
| 8 |
| 1 |
| 8 |
| 2 |
| 9 |
=4
| 1 |
| 2 |
| 1 |
| 2 |
| 7 |
| 8 |
| 1 |
| 8 |
| 1 |
| 2 |
=4
| 1 |
| 2 |
| 7 |
| 8 |
| 1 |
| 8 |
=4
| 1 |
| 2 |
=18．
点评：简算时看到此类“几个乘法相加减”的题，先观察这几个乘法有没有相同因数，或者能不能转化出相同因数．
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