Сколько будет:5 1/4 - 3 7/8
5 1/4 - 3 7/8 = 21/4 - 31/8 = (21*2)/8 - 31/8 = (42-31)/8 = 11/8 = 1 3/8
5 1/4-3 7/8=21/4-31/8=42/8-31/8=11/8=1 3/8