题目内容
(1)计算
-5
+
(2)化简
•(1-
),并计算当x=
-1时代数式的值.
| 40 |
|
| 10 |
(2)化简
| x2+2x |
| x2-1 |
| 1 |
| x |
| 3 |
(1)原式=2
-5×
+
=
;
(2)原式=
•
=
,
将x=
-1代入得:原式=
=
.
| 10 |
| ||
| 10 |
| 10 |
=
| 5 |
| 2 |
| 10 |
(2)原式=
| x(x+2) |
| (x+1)(x-1) |
| x-1 |
| x |
=
| x+2 |
| x+1 |
将x=
| 3 |
| ||
|
3+
| ||
| 3 |
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