Question

Resolva a fração
1/2 + 3/7 - 1/6 *
A)32/21
B)16/32
C)16/21
D)21/16

Answer 1

$\large\boxed{\begin{array}{l}\begin{array}{c|c}\rm2,7,6&\rm2\\\rm1,7,3&\rm3\\\rm1,7,1&\rm7\\\rm1,1,1\end{array}\\\rm mmc(2,7,6)=2\cdot3\cdot7=42\\\rm\dfrac{1}{2}+\dfrac{3}{7}-\dfrac{1}{6}=\dfrac{21+18-7}{42}=\dfrac{32\div2}{42\div2}=\dfrac{16}{21}\\\huge\boxed{\boxed{\boxed{\boxed{\rm\dagger\red{\maltese}~\blue{alternativa~C}}}}}\end{array}}$

Answer 2

Resposta:

1/2 + 3/7 - 1/6 (fazer mmc de 2,6 e 7, que vai dar 42)

21/42 + 18/42 - 7/42 (denominador igual, pode resolver normalmente)

21+18=39-7=32/42 (simplificando por 2)

16/21 LETRA C