题目内容
用配方法使下面等式成立:
(1)x2-2x-3=(x-______)2-______;
(2)x2+0.4x+0.5=(x+______)2+______;
(3)3x2+2x-2=3(x+______)2+______;
(4)
x2+
x-2=
(x+______)2+______.
(1)x2-2x-3=(x-______)2-______;
(2)x2+0.4x+0.5=(x+______)2+______;
(3)3x2+2x-2=3(x+______)2+______;
(4)
| 2 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
(1)x2-2x-3=x2-2x+1-4=(x-1)2-4;
故答案为:1,4
(2)x2+0.4x+0.5=x2+0.4x+0.04+0.46=(x+0.2)2+0.46;
故答案为:0.2,0.46
(3)3x2+2x-2=3(x2+
x)-2=3(x2+
x+
)-
=3(x+
)2-
;
故答案为:
,-
;
(4)
x2+
x-2=
(x2+
x)-2=
(x2+
x+
)-
=
(x+
)2-
;
故答案为:
,-
.
故答案为:1,4
(2)x2+0.4x+0.5=x2+0.4x+0.04+0.46=(x+0.2)2+0.46;
故答案为:0.2,0.46
(3)3x2+2x-2=3(x2+
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 9 |
| 7 |
| 3 |
| 1 |
| 3 |
| 7 |
| 3 |
故答案为:
| 1 |
| 3 |
| 7 |
| 3 |
(4)
| 2 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 4 |
| 49 |
| 24 |
| 2 |
| 3 |
| 1 |
| 4 |
| 49 |
| 24 |
故答案为:
| 1 |
| 4 |
| 49 |
| 24 |
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