Question

Tính giá trị biểu thức

a) 7/5 x 3/4 : 4/5 = ........................................

                           = ........................................

 

Tìm x:

b) x - 3/9 = 8/7

 

Answer 1

nhanh chưa

Answer 2

a) 21/20 : 4/5

= 21/16

b) x = 8/7+3/9

    x = 31/21

Answer 3

Answer 4

a) 7/5 x 3/4 : 4/5 =  21/20 : 4/5 

                           = 21/16

 

Tìm x:

b) x - 3/9 = 8/7

    x          = 8/7 + 3/9

     X         =      31/21

Answer 5

\(\dfrac{7}{5}\times\dfrac{3}{4}:\dfrac{4}{5}=\dfrac{7}{5}\times\dfrac{3}{4}\times\dfrac{5}{4}=\dfrac{7\times3\times5}{5\times4\times4}=\dfrac{7\times3}{4\times4}=\dfrac{21}{16}\)

b) \(x-\dfrac{3}{9}=\dfrac{8}{7}\)

   \(x=\dfrac{8}{7}+\dfrac{3}{9}\)

  \(x=\dfrac{72}{63}+\dfrac{21}{63}\)

  \(x=\dfrac{93}{63}\)

  \(x=\dfrac{31}{21}\)