1/3m · 3/4n · 12p = (1·3·12)/(3·4·1)mnp = 3mnp
при m = 3/20; p = 4/9 и n = 30
3 · 3/20 · 30 · 4/9 = (3·3·30·4)/(1·20·1·9) = 6
ответ: 6.
