题目内容
已知a=
-1,求(1+
)2(a-1)-
的值.
| 3 |
| 1 |
| a-1 |
| a+1 |
| a2-1 |
原式=(
) 2•(a-1)-
=
-
=
=
=a+1,
当a=
-1时,原式=
.
| a |
| a-1 |
| a+1 |
| (a-1)(a+1) |
=
| a2 |
| a-1 |
| 1 |
| a-1 |
=
| a2-1 |
| a-1 |
=
| (a-1)(a+1) |
| a-1 |
=a+1,
当a=
| 3 |
| 3 |
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