题目内容
| 1 |
| 19 |
| 8 |
| 3 |
| 5 |
| 19 |
| 1 |
| 8 |
分析:化
÷
=
×
,再依据积不变性质化
×
=
×
,最后运用乘法分配律解答.
| 1 |
| 19 |
| 8 |
| 3 |
| 1 |
| 19 |
| 3 |
| 8 |
| 5 |
| 19 |
| 1 |
| 8 |
| 1 |
| 19 |
| 5 |
| 8 |
解答:解:
÷
+
×
,
=
×
+
×
,
=
×(
+
),
=
.
| 1 |
| 19 |
| 8 |
| 3 |
| 5 |
| 19 |
| 1 |
| 8 |
=
| 1 |
| 19 |
| 3 |
| 8 |
| 1 |
| 19 |
| 5 |
| 8 |
=
| 1 |
| 19 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 1 |
| 19 |
点评:本题主要考查学生对于乘法分配律变形式的运用掌握情况.
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