Question

17.0 resultado da soma de 1/3 + 1/7 é igual a:
A) 1/10.
B) 2/10
C) 1/21.
D) 10/21.
E) 1.
10 Imornonotonulantom dimanchado 12​

Answer 1

$\Large\boxed{\begin{array}{l}\begin{array}{c|c}\sf3,7&\sf3\\\sf1,7&\sf7\\\sf1,1\end{array}\\\sf m\cdot m\cdot c\,(3,7)=3\cdot7=21\\\\\sf\dfrac{1}{3}+\dfrac{1}{7}=\dfrac{7}{21}+\dfrac{3}{21}=\dfrac{10}{21}\end{array}}$