va rog, repedeeeeee!!!
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Răspuns:
5/21 × 28/ 15 se simplifică prin 7 si 5
1/3×4/3 = 4/9
55/17 ×55/51 se simifica 55
17/51
luam prima dat pe rând ecuatie
1/7×5/3 = 5/3
3/7×5/6 = 15/42
5/3 ×42/15 de simplifică prin 5 si 3
1/1×14/3
14/3