Решение:
1/5t + 7/20t - 1/4t = (4+7-5)/20t = 6/20t = 3/10t
t = 1/6
3/10•1/6 = 1/20
Ответ: 1/20
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Решение:
1/5t + 7/20t - 1/4t = (4+7-5)/20t = 6/20t = 3/10t
t = 1/6
3/10•1/6 = 1/20
Ответ: 1/20