Răspuns:
a) 1/3 - 1/4 = (4 - 3)/12 = 1/12
b) 3/7 - 2/5 = (3x5)/35 - (2x7)/35 = 15/35 - 14/35 = (15-14)/35 = 1/35
c) 3/4 - 2/5 = (3x5)/20 - (2x4)/20 = 15/20 - 8/20 = (15-8)/20 = 7/20
d) 1/3 - 5/24 = (1x8)/24 - 5/24 = 8/24 - 5/24 = (8-5)/24 = 3/24 = 1/8
e) 1/11 - 2/55 = (1x5)/55 - 2/55 = 5/55 - 2/55 = (5-2)/55 = 3/55
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