问题 解答题
(1)化简:
18
-
9
2
-
3
+
6
3
+(
3
-2)0+
(1-
2
)
2

(2)解方程:x2+4x-1=0.
答案

(1)

18
-
9
2
-
3
+
6
3
+(
3
-2)0+
(1-
2
)
2

=3

2
-
3
2
2
-
3+3
2
3
+1+
2
-1

=

3
2
2
-1;

(2)x2+4x-1=0,

x2+4x=1,

x2+4x+4=1+4.

(x+2)2=5,

x+2=±

5

x1=-2+

5
,x2=-2-
5

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