х - неизвестное число; 0,2 = 2/10 = 1/5. Уравнение:
х + (1/6)х + (1/5)х = 1
х + (5/30)х + (6/30)х = 1
(30/30)х + (5/30)х + (6/30)х = 1
(41/30)х = 1
х = 1 : 41/30
х = 1 · 30/41
х = 30/41
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Проверка: 30/41 + 1/6 · 30/41 + 1/5 · 30/41 = 30/41 + 30/246 + 30/205) =
= 900/1230 + 150/1230 + 180/1230 = 1230/1230 = 1
х - неизвестное число; 0,2 = 2/10 = 1/5. Уравнение:
х + (1/6)х + (1/5)х = 1
х + (5/30)х + (6/30)х = 1
(30/30)х + (5/30)х + (6/30)х = 1
(41/30)х = 1
х = 1 : 41/30
х = 1 · 30/41
х = 30/41
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Проверка: 30/41 + 1/6 · 30/41 + 1/5 · 30/41 = 30/41 + 30/246 + 30/205) =
= 900/1230 + 150/1230 + 180/1230 = 1230/1230 = 1