题目内容
先化简再求值:
-
÷
,其中m=-2.
| m |
| m+3 |
| 6 |
| m2+6m+9 |
| 2 |
| m+3 |
原式=
-
×
=
-
=
,
当m=-2时,原式=
=-5.
| m |
| m+3 |
| 6 |
| (m+3)2 |
| m+3 |
| 2 |
=
| m |
| m+3 |
| 3 |
| m+3 |
=
| m-3 |
| m+3 |
当m=-2时,原式=
| -2-3 |
| -2+3 |
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