Resposta:

5/6

Explicação passo-a-passo:

4/12 = 1/3

1/3 + 1/6 + 1/3 = 2/6 + 1/6 + 2/6 = 5/6

Resposta:

[tex]\dfrac{1}{3}+\dfrac{1}{6}+\dfrac{4}{12}=\\ \\ \\ mmc(3,6,12)=12\\ \\ \\ \dfrac{4+2+4}{12}=\dfrac{10}{12}=\boxed{\dfrac{5}{6}}[/tex]