Second grade mathematics 9 = () * () fill in the appropriate number in brackets

Second grade mathematics 9 = () * () fill in the appropriate number in brackets

9=1x9
9=3x3

18 19 22 26 () () fill in the numbers in brackets

33、44
The difference between 18 and 19 is 1,
The difference between 22 and 19 is 3,
The difference between 26 and 22 is 4,
4=1+3
That is, the difference is equal to the sum of the differences of the first two items,
4+3=7
26+7=33

Find the law: 3,8,18,33,53,78, ()

+ 5 in turn
+10
+15
+20
+25
So the last one
+30
78+30=108

Find the law: 1,3,6,8,16,18, (), (), 76,78

Fill in 36, 38

13 68 16 18 () () 76 78 1、3、6、 8、 16、 18、 ()、 ()、 76、 78

1、3、6、 8、 16、 18、 (36)、 (38)、 76、 78
Regularity, + 2, * 2, + 2, * 2

0,1,3,6,8,16,18,（）,（）,76,

0,1,3,6,8,16,18,（36）,（38）,76,78
law:
3*2=6
6+2=8
8*2=16
16+2=18
18*2=36
36+2=38
38*2=76
76+2=78

Filling number: 1,3,6,8,16,18, (), () 76.78

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Find the rule 1-2-5 2-8-16 3-18-33 n -?

The square of N times 2, n * (3N + 2)

Find rules 1, 3, 8, 15, 18, 24 ()

Thirty-two

Fill in the numbers 1, 3, 8, 18, 38 and ()

Deformed arithmetic sequence: an arithmetic sequence in which each term is equal to the sum of the preceding terms plus 2
3=1+(2)
8=1+3+(4)
18=1+3+8+(6)
38=1+3+8+18+(8)
So the fifth item
=1+3+8+18+38+(10)=78