Question

Tìm x : 

a)4/5 : x = 5/7

b)5/6 - 3/5 : x = 2/5

Answer 1

a) x = 4/5 : 5/7

x = 28/25

 

b) 3/5 : x = 5/6 - 2/5

3/5 : x = 13/30

x = 3/5 : 13/30

x = 18/13

Answer 2

\(a,\Leftrightarrow x=\dfrac{4}{5}:\dfrac{5}{7}\)

\(\Leftrightarrow x=\dfrac{28}{25}\)

\(b,\Leftrightarrow\dfrac{3}{5}:x=\dfrac{13}{30}\)

\(\Leftrightarrow x=\dfrac{18}{13}\)

Answer 3

a)\(=>x=\dfrac{4}{5}\times\dfrac{7}{5}=\dfrac{28}{25}\)

b)\(=>x=\dfrac{3}{5}:\left(\dfrac{5}{6}-\dfrac{2}{5}\right)=\dfrac{3}{5}:\dfrac{13}{30}=\dfrac{18}{13}\)

Answer 4

a)4/5 : x = 5/7

x = 4/5 : 5/7

x = 28/25

b)5/6 - 3/5 : x = 2/5

3/5 : x = 5/6 - 2/5

3/5 : x = 13/30

x = 3/5 : 13/30

x = 18/13