题目内容
解方程:5x2-2x-
=x2-6x-
.
| 1 |
| 4 |
| 5 |
| 4 |
5x2-2x-
=x2-6x-
,
5x2-2x-
-x2+6x+
=0,
4x2+4x+1=0,
x2+x+
=0,
(x+
)2=0,
x+
=0,
x=-
.
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| 5 |
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5x2-2x-
| 1 |
| 4 |
| 5 |
| 4 |
4x2+4x+1=0,
x2+x+
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| 4 |
(x+
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| 2 |
x+
| 1 |
| 2 |
x=-
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| 2 |
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