Răspuns:
27:[26+(6xa-7x3):9]+(13-2x2x3)=2
27:[26+(6×a-21):9] + (13 - 12) = 2
27:[26 + ( 6×a-21):9] +1 = 2
27:[26 + (6×a-21):9] = 2-1
27:[26 + (6×a-21):9] = 1
26 + (6×a-21):9 = 27 : 1
26 + (6×a-21):9 = 27
(6×a-21) : 9 = 27-26
(6×a-21) : 9 = 1
6×a-21 = 1 ×9
6×a-21 = 9
6×a = 9+21
6×a = 30
a = 30:6
a = 5
abonare?
