题目内容
(1)计算:3(
-π)0-
+(-1)2011
(2)解方程:(3x-1)(x+2)=11x-4
(3)用配方法解方程3x2-2x-8=0.
| 3 |
| ||||
|
(2)解方程:(3x-1)(x+2)=11x-4
(3)用配方法解方程3x2-2x-8=0.
(1)3(
-π)0-
+(-1)2011
=3×1-(2-
)-1
=3-2+
-1
=
;
(2)(3x-1)(x+2)=11x-4
3x2+5x-2=11x-4
3x2-6x+2=0,
(x-1)2=
,
∴x-1=±
,
∴x=
+1或x=-
+1;
(3)3x2-2x-8=0
x2-
x-
=0,
(x-
)2=
,
∴x-
=±
,
∴x=2或x=-
.
| 3 |
| ||||
|
=3×1-(2-
| 3 |
=3-2+
| 3 |
=
| 3 |
(2)(3x-1)(x+2)=11x-4
3x2+5x-2=11x-4
3x2-6x+2=0,
(x-1)2=
| 1 |
| 3 |
∴x-1=±
| ||
| 3 |
∴x=
| ||
| 3 |
| ||
| 3 |
(3)3x2-2x-8=0
x2-
| 2 |
| 3 |
| 8 |
| 3 |
(x-
| 1 |
| 3 |
| 25 |
| 9 |
∴x-
| 1 |
| 3 |
| 5 |
| 3 |
∴x=2或x=-
| 4 |
| 3 |
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