题目内容
(1)计算:
+
-(
-1)0
(2)3
÷(3
-2
)
(3)解方程:x2-6x+1=0.
| 2 | ||
|
| 27 |
| 3 |
(2)3
| 12 |
|
| 3 |
(3)解方程:x2-6x+1=0.
(1)原式=
•
+3
-1
=
+3
-1
=
+1+3
-1
=4
.
(2)原式=6
÷(
-2
)
=6
÷(-
)
=-6
(3)x2-6x+1=0
∵a=1,b=-6,c=1,
∴b2-4ac=(-6)2-4×1×1=32
∴x=
=
=3±2
,
∴x1=3+2
,x2=3-2
.
| 2 | ||
|
| ||
|
| 3 |
=
2(
| ||
(
|
| 3 |
=
| 3 |
| 3 |
=4
| 3 |
(2)原式=6
| 3 |
| 3 |
| 3 |
=6
| 3 |
| 3 |
=-6
(3)x2-6x+1=0
∵a=1,b=-6,c=1,
∴b2-4ac=(-6)2-4×1×1=32
∴x=
6±
| ||
| 2×1 |
6±4
| ||
| 2 |
| 2 |
∴x1=3+2
| 2 |
| 2 |
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