问题 解答题
(1)计算:9
45
÷3
1
10
-
3
2
6
×
2
2
3

(2)解方程:2(x+2)2=x2-4.
答案

(1)9

45
÷3
1
10
-
3
2
6
×
2
2
3

=9

45
×
10
3
-
3
2
6
×
 
8
 
3
 

=3

450
-
8

=45

2
-2
2

=43

2

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

2(x+2)2=(x+2)(x-2),

2(x+2)2-(x+2)(x-2)=0,

(x+2)[2(x+2)-(x-2)]=0,

即(x+2)(x+6)=0,

可化为:x+2=0或x+6=0,

解得:x1=-2,x2=-6.

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