个回答

• qq_慕先生0544640

  2019-05-28 19:25:23

  factorial(5)=5*factorial(4)
  factorial(4)=4*f....(3)
  f..(3)=3*f...(2)
  f...(2)=2*f...(1)
  f...(1)=1
  所以是1*2*3*4*5

  
  

  3