Calculeaza:
Dau coroana+50 pct

Răspuns:
x = 5/8
Explicație pas cu pas:
[(2x + 15/4) : 5/2 + 1/2] : 1/2 = 5
[(2x + 15/4) × 2/5 + 1/2] × 2/1 = 5
(4x/5 + 30/20 + 1/2) × 2 = 5
(4x/5 + 3/2 + 1/2) × 2 = 5
(4x/5 + 4/2) × 2 = 5
8x/5 + 8/2 = 5
8x/5 + 4 = 5
8x/5 = 1
8x = 5
x = 5/8