Question

efectuati: 1 supra 5 + 11 supra 30; 5 supra 9 + 7 supra 18; 12 supra 13+ 2 supra9; 1 supra 8+ 35 supra 72; 5 supra 12 + 15 supra 48

Answer 1

$\frac{5}{9} + \frac{7}{18} = \frac{5}{9} Ampilificam cu 2= \frac{10}{18}+ \frac{7}{18} = \frac{17}{18} ;$ $\frac{1}{5} + \frac{11}{30} = \frac{1}{5} Ampilificam cu 6= \frac{6}{30}+ \frac{11}{30} = \frac{17}{30} ;$