题目内容
计算与化简:
(1)
-
+3
(2)a
-a2
+3
(a>0)
(3)
+(
)2(a≤1)
(1)
| 18 |
| 50 |
| 8 |
(2)a
| 8a |
|
| 2a3 |
(3)
| a2-4a+4 |
| 1-a |
(1)原式=3
-5
+6
,
=4
;
(2)原式=2a
-
a
+3a
,
=
a
;
(3)
+(
)2,
=
+1-a,
=2-a+1-a,
=1-2a.
| 2 |
| 2 |
| 2 |
=4
| 2 |
(2)原式=2a
| 2a |
| 1 |
| 2 |
| 2a |
| 2a |
=
| 9 |
| 2 |
| 2a |
(3)
| a2-4a+4 |
| 1-a |
=
| (a-2)2 |
=2-a+1-a,
=1-2a.
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