问题
解答题
(1)计算:
(2)用配方法解方程:x2-2x-2=0. |
答案
(1)由题得,
-227
-68
+1 3
=318
-43
-22
+33
=2
-3
;2
(2)∵x2-2x-2=0,
∴x2-2x=2,
∴x2-2x+1=2+1,
∴(x-1)2=3,
解得x1=1+
,x2=1+3
.3
(1)计算:
(2)用配方法解方程:x2-2x-2=0. |
(1)由题得,
-227
-68
+1 3
=318
-43
-22
+33
=2
-3
;2
(2)∵x2-2x-2=0,
∴x2-2x=2,
∴x2-2x+1=2+1,
∴(x-1)2=3,
解得x1=1+
,x2=1+3
.3