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a) 1supra2+5supra4   .  b) 1supra9+3supra7  .  c) 1supra6+3supra8  .  d) 3supra8+13supra117  .  e) 1supra5+7supra15+5supra8   .  f) 1supra4+7supra24+5supra8  .  g) 3+1supra4+2supra5  . h) 1supra5-1supra7 .  i) 8supra13-5supra39.

Răspuns :

Danaradu70
Se aduc la acelasi numitor fractiile si apoi se aduna numaratorii
a) 1/2+5/4=2/4+5/4=7/4
b) 1/9+3/7=7/63+27/63=34/63
c) 1/6+3/8=8/48+18/48=26/48=13/24
d) 3/8+13/117=3/8+1/9=27/72+8/72=35/72
e)1/5+7/15+5/8=24/120+56/120+75/120=155/120=31/24
f)1/4+7/24+5/8=6/24+7/24+15/24=28/24=7/6

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