Question

Tính giá trị biểu thức :

\(\dfrac{9}{5}-\dfrac{3}{4}:\dfrac{5}{6}=?\)

Tìm x :

\(\dfrac{7}{9}:x=\dfrac{5}{7}\)

Answer 1

\(\dfrac{9}{5}-\dfrac{3}{4}:\dfrac{5}{6}=\dfrac{9}{5}-\dfrac{9}{10}=\dfrac{9}{10}\)

\(x=\dfrac{7}{9}:\dfrac{5}{7}=\dfrac{49}{45}\)

Answer 2

\(=\dfrac{9}{5}-\dfrac{3}{4}x\dfrac{6}{5}=\dfrac{9}{5}-\dfrac{9}{10}=\dfrac{18}{10}-\dfrac{9}{10}=\dfrac{9}{10}\)

 

\(x=\dfrac{7}{9}:\dfrac{5}{7}\)

\(x=\dfrac{49}{45}\)

Answer 3

9/5-3/4:5/6=9/5-9/10=9/10

7/9:x=5/7

x=7/9:5/7

x=49/45

Answer 4

\(\dfrac{9}{5}-\dfrac{3}{4}\div\dfrac{5}{6}=\dfrac{9}{5}-\dfrac{9}{10}=\dfrac{18}{10}-\dfrac{9}{10}=\dfrac{9}{10}\)

\(\dfrac{7}{9}\div x=\dfrac{5}{7}\)

        \(x=\dfrac{7}{9}\div\dfrac{5}{7}\) 

         \(x=\dfrac{49}{45}\)

Answer 5

=\(\dfrac{21}{20}\)x\(\dfrac{6}{5}\)=\(\dfrac{61}{50}\)

x=\(\dfrac{49}{45}\)