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fractia 15supra9+12supra20+2supra15

Răspuns :

[tex] \frac{15}{9} = \frac{5}{3} [/tex]
[tex] \frac{12}{20} = \frac{3}{5} [/tex]
[tex] \frac{5}{3} + \frac{3}{5} + \frac{2}{15} = \frac{5*5+3*3+2}{15} = \frac{36}{15} = \frac{12}{5} [/tex]