Question

Tìm x 

a) x : 1/4 = 7/5

b) 9/2 - x = 3/5

c) 12/5 : x = 7/2

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Answer 1

a) x : 1/4 = 7/5
    x         = 7/5 x 1/4
    x         = 7/20
b) 9/2 - x = 3/5
            x = 9/2 - 3/5
            x = 39/10
c) 12/5 : x = 7/2
              x = 12/5 : 7/2
              x = 24/35

Answer 2

a) \(x\div\dfrac{1}{4}=\dfrac{7}{5}\)

    \(x=\dfrac{7}{5}\times\dfrac{1}{4}\)

    \(x=\dfrac{7}{20}\)

b) \(\dfrac{9}{2}-x=\dfrac{3}{5}\)

            \(x=\dfrac{9}{2}-\dfrac{3}{5}\)

            \(x=\dfrac{39}{10}\)

c) \(\dfrac{12}{5}\div x=\dfrac{7}{2}\)

             \(x=\dfrac{12}{5}\div\dfrac{7}{2}\)

             \(x=\dfrac{12}{5}\times\dfrac{2}{7}\)

             \(x=\dfrac{24}{35}\)

Answer 3

a)\(x=\dfrac{1}{4}\)x\(\dfrac{7}{5}=\dfrac{7}{20}\)

b)\(x=\dfrac{9}{2}-\dfrac{3}{5}=\dfrac{39}{10}\)

c)\(x=\dfrac{12}{5}:\dfrac{7}{2}=\dfrac{24}{35}\)

Answer 4

a,  x : 1/4 = 7/5

      x        = 7/5 x 1/4 

      x        =   7/20

b, 9/2 - x = 3/5

             x = 9/2 - 3/5 

             x =  39/10 

c,12/5 : x = 7/2

             x = 12/5 : 7/2 

             x =   24/35

Answer 5

a) x = 7/5 x 1/4

x = 7/20

b) x = 9/2 - 3/5

x = 39/10

c) x = 12/5 : 7/2

x = 24/35