Răspuns:
Explicație pas cu pas:
a)
19/8 + 79/24 = 57/24 + 79/24 = 136/24
14/3 - 9/8 = 112/24 - 27/24 = 85/24
136/24 : 85/24 = 136/24 * 24/85 = 136/85 = 8/5
b)
28/5 - 4/3 = 84/15 - 20/15 = 64/15
91/12 - 9/4 = 91/12 - 27/12 = 64/12
64/15 : 64/12 = 64/15 * 12/64 = 12/15 = 4/5
