Пошаговое объяснение:
3/9 = 7/21
3/9 = (3:3)/(9:3) = 1/3
7/21 = (7:7)/(21:7) = 1/3
1/3 = 1/3
Пропорция верна
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Verified answer
Пошаговое объяснение:
3/9 = 7/21
3/9 = (3:3)/(9:3) = 1/3
7/21 = (7:7)/(21:7) = 1/3
1/3 = 1/3
Пропорция верна