按规律填数40 ,31,24,19,16()

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按规律填数40,31,24,19,16()按规律填数40,31,24,19,16()按规律填数40,31,24,19,16()40,31,24,19,16(15)相差的是9,7,5,3,115,依次减

按规律填数40 ,31,24,19,16()
按规律填数40 ,31,24,19,16()

按规律填数40 ,31,24,19,16()
40 ,31,24,19,16(15)
相差的是9,7,5,3,1

15,依次减9,减7,减5,减3,(减1)

15
40-9=31
31-7=24
24-5=19
19-3=16
16-1=15

按规律填数40 ,31,24,19,16(15)
40-31=9
31-24=7
24-19=5
19-16=3
16-15=1

15

40 ,31,24,19,16(15)

15