а) х - 1/7 = 4/21 б) х - 3/5 = 2/5
х - 3/21 = 4/21 х = 2/5 + 3/5
х = 4/21 + 3/21 х = 5/5
х = 7/21 х = 1
х = 1/3 - сократили на 7
а) х - 1/7 = 4/21 б) х - 3/5 = 2/5
х - 3/21 = 4/21 х = 2/5 + 3/5
х = 4/21 + 3/21 х = 5/5
х = 7/21 х = 1
х = 1/3 - сократили на 7