Question

1-1/5-2/7=

Answer 1

\(1-\dfrac{1}{5}-\dfrac{2}{7}=\dfrac{35}{35}-\dfrac{7}{35}-\dfrac{10}{35}=\dfrac{18}{35}\)

Answer 2

\(=1-\left(\dfrac{1}{5}+\dfrac{2}{7}\right)\\ =1-\left(\dfrac{7}{35}+\dfrac{10}{35}\right)\\ =\dfrac{35}{35}-\dfrac{17}{35}=\dfrac{18}{35}\)

Answer 3

\(1-\dfrac{1}{5}-\dfrac{2}{7}\)

\(=\dfrac{4}{5}-\dfrac{2}{7}\)

\(=\dfrac{28}{35}-\dfrac{10}{35}\)

\(=\dfrac{18}{35}\)

Answer 4

cảm ơn

 

Answer 5

=1−(1/5+2/7)=1−(7/35+10/35)=35/35−17/35=18/35

Answer 6

\(\dfrac{18}{35}\)