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Efectuati: a)4/9+(7/9-2/9); b)(3/10+7/10)-3/4; c)2/3+4/15

Răspuns :

a)4/9+(7/9-2/9)
4\9+5\9=9\9=1
b)(3/10+7/10)-3/4
10\10-3\4=20\20-15\20=5\20=1\4
c)2/3+4/15
10\15+4\15=14\15