Question

quanto é:
1/4 + 1/6 =
2/5 + 1/3 =
4/5 - 1/3 =
5/7 - 1/2 =

Answer 1

Explicação passo-a-passo:

$\sf \dfrac{1}{4}+\dfrac{1}{6}=\dfrac{3\cdot1+2\cdot1}{12}=\dfrac{3+2}{12}=\red{\dfrac{5}{12}}$

$\sf \dfrac{2}{5}+\dfrac{1}{3}=\dfrac{3\cdot2+5\cdot1}{15}=\dfrac{6+5}{15}=\red{\dfrac{11}{15}}$

$\sf \dfrac{4}{5}-\dfrac{1}{3}=\dfrac{3\cdot4-5\cdot1}{15}=\dfrac{12-5}{15}=\red{\dfrac{7}{15}}$

$\sf \dfrac{5}{7}-\dfrac{1}{2}=\dfrac{2\cdot5-7\cdot1}{14}=\dfrac{10-7}{14}=\red{\dfrac{3}{14}}$