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多选题
Which two of the following are NOT solutions of (x-5) (x-3) (x-9) (x+9) =0?
A

-9

B

-5

C

-3

D

3

E

5

F

9


参考答案

参考解析
解析:
要想(x-5) (x-3) (x-9) (x+9) =0,只需x-5=0,或x-3=0,或x-9=0,或x+9=0,因此x可以是5,或3,或9,或-9。选项中只有B、C不符合条件。
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