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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