题目内容
(1)计算:|-4|+(
+1)0-
;
(2)先化简,再求值:(1-
)÷
,其中a=
.
| 2 |
| 12 |
(2)先化简,再求值:(1-
| 1 |
| a+1 |
| a2-a |
| a+1 |
| 1 |
| 2 |
(1)原式=4+1-2
=5-2
;
(2)原式=(
-
)×
=
•
=
,
当a=
时,原式=
=-2.
| 3 |
=5-2
| 3 |
(2)原式=(
| a+1 |
| a+1 |
| 1 |
| a+1 |
| a+1 |
| a(a-1) |
=
| a |
| a+1 |
| a+1 |
| a(a-1) |
=
| 1 |
| a-1 |
当a=
| 1 |
| 2 |
| 1 | ||
|
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