adu la acelasi numitor fractiile urmatoare dau coroana
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e) 13/11 ; 7/9 → 117/99 ; 77/99
f) 32/12 ; 13/14 → 8/3 ; 13/14 → 112/42 ; 39/42
g) 18/42 + 77/35 → 3/7 + 77/35 → 15/35 ; 77/35
h) 2/7 ; 3/8 ; 5/14 → 16/56 ; 21/56 ; 20/56