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15.a)
1/3+5/18+2/9+4/27;b)3/20+47/180+4/15+7/60;
c)3/25+7/60+11/50+13/100​

Răspuns :

a) 1/3+5/18+2/9
-Vom aduce fractiile la acelasi numitor-
1/3 il simplificam cu 6
5/18 cu 1
2/9 cu 2
si obtinem :

6/18+5/18+4/18= 15/18

Denis8070

Răspuns:

a) 1/3 + 5/18 + 2/9 + 4/27 = 18/54 + 15/54 + 12/54 + 8/54 = 53/54

b) 3/20 + 47/180 + 4/15 + 7/60 = 27/180 + 47/180 + 48/180 + 21/180 = 143/180

c) 3/25 + 7/60 + 11/50 + 13/100 = 36/300 + 35/300 + 66/300 + 39/100 = 176/300 = 44/75

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