题目内容
(| 3x |
| x-2 |
| x |
| x+2 |
| x2-4 |
| x |
分析:本题直接运用分配律,把括号去掉,然后进行约分化简.
解答:解:(
-
)×
=
×
-
×
=3(x+2)-(x-2)
=3x+6-x+2
=2x+8.
| 3x |
| x-2 |
| x |
| x+2 |
| x2-4 |
| x |
=
| 3x |
| x-2 |
| (x+2)(x-2) |
| x |
| x |
| x+2 |
| (x+2)(x-2) |
| x |
=3(x+2)-(x-2)
=3x+6-x+2
=2x+8.
点评:直接运用分配律比较简单.
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