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9,7,5,3,1
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