题目内容
(1)计算
+
-(π-3.14)0+(-
)-1
(2)先化简再求值 (x-1-
)÷
,其中x=3-
.
| (-5)2 |
| 2 | ||
|
| ||
| 3 |
(2)先化简再求值 (x-1-
| 8 |
| x+1 |
| x+3 |
| x+1 |
| 2 |
(1)原式=5+
-1-1-
=3;
(2)原式=
×
=
×
=x-3,
当x=3-
时,原式=3-
-3=-
.
| 3 |
| 3 |
=3;
(2)原式=
| (x+1)(x-1)-8 |
| x+1 |
| x+1 |
| x+3 |
=
| (x+3)(x-3) |
| x+1 |
| x+1 |
| x+3 |
=x-3,
当x=3-
| 2 |
| 2 |
| 2 |
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