找规律填空 1,3,7,13,21,() 64,48,40,36,() )

问题描述:

找规律填空 1,3,7,13,21,() 64,48,40,36,() )

31 34
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你看一下相邻两数的差

1,3,7,13,21, (31)
1+2=3,3+4=7,7+6=13,13+8=21,21+10=31
64,48,40,36,(34)
64-16=48,48-8=40,40-4=36,36-2=34

32和34
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1+2=3,3+2*2=7,7+2*3=13,13+2*4=21,21+2*5=31,