200 220
39 15
200 220 2 , 2 , 3 ,............... =200 200=/2(2+(-1)2)= ^2======>1 =220 220=/2(4+(-1)2)=+^2====>2 10/ 11=/(1+) =10 =20 =1 =1, 2 , 3, 4, ......................
3 formula
: 1 (0 1 )
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