Найдите неизвестный член пропорции: 1) 3.5 : х = 2.4 : 4.8
2) х: 2, 1/5 = 9.2 : 2.3
3) 7.2 : 2.4 = х: 4, 1/3
4) 4, 2/7 : 2, 1/7 = 3.2 : х

Фотка если что в закрепе)
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