题目内容
先化简,再求值:(1-
)÷
,其中a=1+
.
| 1 |
| a+1 |
| a2-a |
| a+1 |
| 3 |
(1-
)÷
=
×
=
,
当a=1+
时,原式=
.
| 1 |
| a+1 |
| a2-a |
| a+1 |
=
| a+1-1 |
| a+1 |
| a+1 |
| a(a-1) |
=
| 1 |
| a-1 |
当a=1+
| 3 |
| ||
| 3 |
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题目内容
| 1 |
| a+1 |
| a2-a |
| a+1 |
| 3 |
| 1 |
| a+1 |
| a2-a |
| a+1 |
| a+1-1 |
| a+1 |
| a+1 |
| a(a-1) |
| 1 |
| a-1 |
| 3 |
| ||
| 3 |