题目内容
(1)解方程:x2-4x-4=0;
(2)计算:(2
-
)÷
+2
.
(2)计算:(2
| 24 |
| 18 |
| 3 |
|
(1)∵x2-4x=4,
∴x2-4x+4=4+4,
∴(x-2)2=8,
∴x-2=±2
解得x1=2+2
,x2=2-2
.
(2)(2
-
)÷
+2
=(4
-3
)÷
+
=4
-
+
=4
.
∴x2-4x+4=4+4,
∴(x-2)2=8,
∴x-2=±2
| 2 |
解得x1=2+2
| 2 |
| 2 |
(2)(2
| 24 |
| 18 |
| 3 |
|
=(4
| 6 |
| 2 |
| 3 |
| 6 |
=4
| 2 |
| 6 |
| 6 |
=4
| 2 |
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