题目内容
①计算:(3
+
-4
)÷
②先化简、再求值:(1-
)÷
,其中x=
+1.
18 |
1 |
5 |
50 |
|
32 |
②先化简、再求值:(1-
1 |
x+1 |
x |
x2-1 |
2 |
(1)原式=(9
+
-2
)÷4
=8
÷4
=2;
(2)原式=
•
=x-1,
当x=
+1时,原式=
+1-1=
.
2 |
2 |
2 |
2 |
=8
2 |
2 |
=2;
(2)原式=
x+1-1 |
x+1 |
(x+1)(x-1) |
x |
=x-1,
当x=
2 |
2 |
2 |
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