Question

Efectuati calculele : 2/7 + 5/7 = b) 3/11+6/11+2/11= c) 1/2+13+16= e) 5/6-1/4-5/12=

Answer 1

$a) \frac{2}{7} + \frac{5}{7} = \frac{7}{7} = 1 \\ b) \frac{3}{11} + \frac{6}{11} + \frac{2}{11} = \\ \frac{9}{11} + \frac{2}{11} = \frac{11}{11} = 1 \\ c) \frac{1}{2} + 13 + 16 = \\ \frac{1}{2} + \frac{26}{2} + \frac{32}{2} = \\ \frac{59}{2} = 29.5 \\ d) \frac{5}{6} - \frac{1}{4} - \frac{5}{12} = \\ \frac{10}{12} - \frac{3}{12} - \frac{5}{12} = \\ \frac{7}{12} - \frac{5}{12} = \frac{2}{12}$