Răspuns:
avem numerele a,b,c,d.
a:b=2 rest 1
b:c=2 rest 1
c:d=2 rest 1;
a=2b+1
b=2c+1
c=2d+1
a+b+c+d=2b+1+2c+1+2d+1+d
stim ca b este 2c+1
2b+1=4c+2+1=4c+3
S=4c+3+2c+1+2d+1+d
S=6c+4+3d+1
stim ca c=2d+1
6c=12d+6
S=12d+6+4+3d+1
S=15d+11=2021
15d=2010
R:
d=134
c=134x2+1=269
b=269x2+1=539
a=539x2+1=1079
RASPUNS: a=1079,b=539,c=269,d=134.
