题目内容
用公式法解方程:2x2-
x-
=0.
| 2 |
| 1 |
| 2 |
2x2-
x-
=0
∵a=2,b=-
,c=-
,
∴△=(-
)2-4×2×(-
)=6>0,
x=
=
.
| 2 |
| 1 |
| 2 |
∵a=2,b=-
| 2 |
| 1 |
| 2 |
∴△=(-
| 2 |
| 1 |
| 2 |
x=
| ||||
| 2×2 |
| ||||
| 4 |
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