Răspuns:
a=(2/3 + 25/24) × 12/31
! ACOLO E 41 LA NUMITOR, NU 31 !
a=41/24 × 12/41
a=1/2 Adevărat
b=3rad2/2 : (5rad2 - 3/2 × 2rad2)
b=3rad2/2 : (5rad2 - 3rad2/2)
b=3rad2/2 : 7rad2/2
b=3rad2/2 × 2/7rad2
b=3/7
N=2rad(2×1/2) + 2×3/7
.....
b sau N nu sunt scrise corect...