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Fill in 4 / 7, 2 / 7 and 1 / 7 according to the rule
4/7,2/7,1/7
The following are: 1 / 14, 1 / 28, 1 / 56
The common ratio is 1 / 2
It's the first number multiplied by 1 / 2 to get the next number
Fill in 1, 12, 35, () ()
1、12、35、（70）（117）（165）
1=1*1
12=3*4
35=5*7
70=7*10
117=9*13
165=11*15
Fill in the blanks according to the rule, 6.7.13.20. () 53. ()?
33 and 86 are the sum of the first two items
1 3 7 8. What's the rule?
1 3 7 8.10.14.15.17.21.22 1+2=3+4=7+1=8
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