Răspuns:
Explicație pas cu pas:
96-(14-3×(15:(64:a+1)+1))×3=90
(14-3×(15:(64:a+1)+1))×3 = 96 - 90 = 6
14-3×(15:(64:a+1)+1) = 6 : 3 = 2
3×(15:(64:a+1)+1) = 14 - 2 = 12
15:(64:a+1)+1 = 12 : 3 = 4
15:(64:a+1) = 4 - 1 = 3
64:a+1 = 15 : 3 = 5
64:a = 5 - 1 = 4
a = 16