2, 3, 7, 18, 47, Come on,

2, 3, 7, 18, 47, Come on,

one hundred and twenty-three
2 3 7 18 47
—1 4 11 29 76
——3 7 18 47
The second line is the difference of the first line
The third line is the difference of the second line
The difference in the third row is the same as that in the first row

1-1-3-4-5-9-7-16 primary school mathematics
Now mathematics is very difficult. Who are they

1 3 5 7^
1 4 9 16
The first and the third are all adjacent odd numbers
The second and the fourth are the expansion of odd numbers, for example, 1 + 3 = 4, 4 + 5 = 9, 9 + 7 = 16

9,11,17,27,(),
How much is it in brackets? How to get it?

Let x 3 + 9-1 = 11 + 17-1 = 27  ① 27 + X-1 = 69, ② 17 + 27-1 = x x = 43, x = 43 in brackets (you see: 3 + 9-1 = 11 + 17-1 = 27, according to this rule, every two numbers are equal to the third number)

What are 56, 60, 63, 68, 72, 80, 84, 88, 90, 96, 98, 120, 125, 175, 180 respectively equal to under the root sign

√56=2√14,
60=2√15,
63=3√7,
68=2√17,
72=6√2,
80=4√5,
84=2√21,
88=2√22,
90=3√10,
96=4√6,
98=7√2,
120=2√30,
125=5√5,
175=5√7,
180=6√5