Question

efectuati operatiile 2 supra 5 +4 supra 15 simplificati si apoi adunati cu 7 supra 9

Answer 1

$\frac{2}{5} + \frac{5}{15} = \frac{2*3}{5*3} + \frac{5}{15} = \frac{6}{15} + \frac{5}{15} = \frac{11}{15}$

$\frac{11}{15} + \frac{7}{9} = \frac{11*3}{15*3} + \frac{7*5}{9*5} =\frac{33}{45} + \frac{35}{45} = \frac{68}{45} }$