题目内容
化简:(a-
)÷
•
.
| a |
| a+1 |
| a2-2a |
| a2-4 |
| a+1 |
| a23a+2 |
(a-
)÷
•
.
=[
]×
•
=
×
•
=
=
.
| a |
| a+1 |
| a2-2a |
| a2-4 |
| a+1 |
| a23a+2 |
=[
| a(a+1)-a |
| a+1 |
| (a+2)(a-2) |
| a(a-2) |
| a+1 |
| (a-2)(a-1) |
=
| a2 |
| a+1 |
| (a+2)(a-2) |
| a(a-2) |
| a+1 |
| (a-2)(a-1) |
=
| a2(a+2) |
| a(a-1)(a-2) |
=
| a(a+2) |
| (a-1)(a-2) |
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