2 3 5 18 12 ( ) ( )括号2 3 5 18 12 ( ) ( )括号里应填几?

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2351812()()括号2351812()()括号里应填几?2351812()()括号2351812()()括号里应填几?2351812()()括号2351812()()括号里应填几?2351812

2 3 5 18 12 ( ) ( )括号2 3 5 18 12 ( ) ( )括号里应填几?
2 3 5 18 12 ( ) ( )括号
2 3 5 18 12 ( ) ( )括号里应填几?

2 3 5 18 12 ( ) ( )括号2 3 5 18 12 ( ) ( )括号里应填几?
2 3 5 18 12 ( 258 ) ( 882 )
2,3,5,18,12,258,882,……