What are the rules of 1,3,8,19,39,71118

What are the rules of 1,3,8,19,39,71118


The difference between the above numbers is 2511203247, and the difference between the above numbers is 3691215, which is an arithmetic sequence



How to calculate 21-120% + x = 9!


21-120%+x=9
21-1.2+x=9
x=9-21+1.2
x=-10.8



Solving equation (100-80) * (120 / 80-x) = 100 * 10% x + 80x


20*(1.5-x)=90x
30-20x=90x
30=110x
x=3/11



Solution equation: 76-80% x = 60


76-80%X=60
0.8x=76-60
0.8x=16
x=16/0.8
x=20