a) [tex]\frac{1}{3}+\frac{1}{7} = \frac{7}{21}+\frac{3}{21}=\frac{7+3}{21} =\frac{10}{21}[/tex]
b) [tex]\frac{2}{3}+\frac{3}{7}+\frac{4}{21} =\frac{14}{21}+\frac{9}{21}+\frac{4}{21} =\frac{14+9+4}{21} =\frac{27}{21}=\frac{9}{7}[/tex]
c) [tex]\frac{4}{5}+1+\frac{2}{6} =\frac{4}{5}+\frac{1}{3}+1 =\frac{1}{1}+\frac{4}{5}+\frac{1}{3} =\frac{15}{15}+\frac{12}{15}+\frac{5}{15} =\frac{15+12+5}{15} =\frac{32}{15}[/tex]
Sper că te-am ajutat!
Succes!
#copăceibrainly
