题目内容
配方:
(1)x2+6x+
(2)x2-5x+
=(x-
)2
(3)x2-
x+
=(x-
)2
(4)4x2-4x+
(1)x2+6x+
9
9
=(x+3
3
)2 (2)x2-5x+
| 25 |
| 4 |
| 25 |
| 4 |
| 5 |
| 2 |
| 5 |
| 2 |
(3)x2-
| 2 |
| 3 |
| 1 |
| 9 |
| 1 |
| 9 |
| 1 |
| 3 |
| 1 |
| 3 |
(4)4x2-4x+
1
1
=(2x-1
1
)2.分析:分别根据完全平方公式求解.
解答:解:(1)x2+6x+9=(x+3)2;
(2)x2-5x+
=(x-
)2;
(3)x2-
x+
=(x-
)2;
(4)4x2-4x+1=(2x-1)2.
故答案为9,3;
,
;
,
;1,1.
(2)x2-5x+
| 25 |
| 4 |
| 5 |
| 2 |
(3)x2-
| 2 |
| 3 |
| 1 |
| 9 |
| 1 |
| 3 |
(4)4x2-4x+1=(2x-1)2.
故答案为9,3;
| 25 |
| 4 |
| 5 |
| 2 |
| 1 |
| 9 |
| 1 |
| 3 |
点评:本题考查了配方法的应用:配方法的理论依据是公式a2±2ab+b2=(a±b)2.
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