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7 i 3/4 = 31/4 = 155/20
6 = 120/20)
(112/20+155/20+120/20)/3 = 387/20 :3 = 387/20*1/3 = 129/20 = 6,45
2
12 4/5 = 12,8
5 3/4 = 5,75
10 1/2 = 10,5
8 1/4 = 8,25
śr = (12,8+5,75+10,5+8,25)/4 = 37/3 :4 = 9,325
19,35/3= 6,45
37,30/4=9 i 13/40