题目内容
解答下列各题:
(1)计算:(
)-1-(2010-
)0+4sin30°-|-2|;
(2)化简并求值:(x-
)÷
,其中x=
.
(1)计算:(
| 1 |
| 2 |
| 3 |
(2)化简并求值:(x-
| x-4 |
| x-3 |
| x2-4 |
| x-3 |
| 5 |
(1)原式=2-1+4×
-2,
=2-1+2-2,
=1.
(2)当x=
时,
原式=[
-
]×
,
=
×
,
=
,
=
,
=9-4
.
| 1 |
| 2 |
=2-1+2-2,
=1.
(2)当x=
| 5 |
原式=[
| x(x-3) |
| x-3 |
| x-4 |
| x-3 |
| x-3 |
| (x+2)(x-2) |
=
| (x-2)2 |
| x-3 |
| x-3 |
| (x+2)(x-2) |
=
| x-2 |
| x+2 |
=
| ||
|
=9-4
| 5 |
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