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  1. import array
  2. seq=[input(),input(),input(),input()]
  3. a=int(seq[0])
  4. b=int(seq[1])
  5. c=int(seq[2])
  6. d=int(seq[3])
  7. if (a+c-2*b)==0:
  8.     print('此為等差數列，')
  9.     print('此數列第五項為：'+str(2*d-c))
Success #stdin #stdout 0.03s 9276KB
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此為等差數列，
此數列第五項為：16
https://ideone.com/LOKXcV
language:
Python 3 nbc (python 3.7.3)
created:
7 days ago
visibility:
public

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