Пошаговое объяснение:
9/20 = 27/60; ( 27/60 = 9*3/20*3 = 9/20)
5/7 =105/147; (105/147 = 5*21/7*21 = 5/7)
7/9 = 126/162; (126/162 = 7*18/9*18 = 7/9).
Пошаговое объяснение:
9/20 = 27/60; ( 27/60 = 9*3/20*3 = 9/20)
5/7 =105/147; (105/147 = 5*21/7*21 = 5/7)
7/9 = 126/162; (126/162 = 7*18/9*18 = 7/9).