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cum se rezolva ecuatia 3 supra 4 plus 3 supra 5

Răspuns :


[tex] \frac{5X3}{20} + \frac{4X3}{20} = \frac{15+12}{20} = \frac{27}{20} =1,35 [/tex]
[tex]\displaystyle \frac{3}{4} + \frac{3}{5} = \frac{15}{20} + \frac{12}{20} = \frac{27}{20} [/tex]