题目内容
(1)计算:
+6
-2x
(2)
+
-2
-
-
;
(3)解方程:x2+4x-1=0
(4)x2+3=3(x+1).
| 2 |
| 3 |
| 9x |
|
|
(2)
| 0.5 |
| 32 |
|
|
| 75 |
(3)解方程:x2+4x-1=0
(4)x2+3=3(x+1).
(1)原式=2
+3
-2
=3
;
(2)原式=
+4
-
-
-5
=
-
;
(3)配方得:(x+2)2=5,
∴x+2=±
,
解得:x1=-2+
,x2=-2-
;
(4)由原方程,得
x(x-3)=0,
∴x=0或x-3=0,
解得,x=0或x=3.
| x |
| x |
| x |
| x |
(2)原式=
| ||
| 2 |
| 2 |
2
| ||
| 3 |
| ||
| 4 |
| 3 |
| 17 |
| 4 |
| 2 |
| 17 |
| 3 |
| 3 |
(3)配方得:(x+2)2=5,
∴x+2=±
| 5 |
解得:x1=-2+
| 5 |
| 5 |
(4)由原方程,得
x(x-3)=0,
∴x=0或x-3=0,
解得,x=0或x=3.
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