Verified answer

1) 4 1/8 - 2 4/7 = (1+4*8)/8 - (4+2*7)/7 = 33/8 - 18/7 = (33*7)/8*7 - (18*8)/7*8 = 231/56 - 144/56 = (231-144)/56 = 86/56 = (1*56+31)/56 = 1 31/56

2) 3 4/8 - 2 4/8 = (4+3*8)/8 - (4+2*8)/8 = 28/8 - 20/8 = 8/8 = 1

3) 3 2/8 - 2 4/8 = (2+3*8)/8 - (4+2*8)/8 = 26/8 - 20/8 = 6/8 = (3*2)/4*2 = 3/4

4) 3 - 2 4/8 = (3 - 2 - 4)/8 = (1 - 4)/8 = (1*8)/8 - 4/8 = 8/8 - 4/8 = 4/8 = (1*4)/2*4 = 1/2

/ - это дробь.