Question

tìm x

Answer 1

= (\(\dfrac{4}{6}+\dfrac{14}{6}\)) + (\(\dfrac{7}{13}+\dfrac{19}{13}\)) +( \(\dfrac{17}{9}+\dfrac{1}{9}\))

= 3 + 2 + 2

= 7

Answer 2

Bài 1)

= ( 4/6 + 14/6) + ( 7/13 + 19/13) + ( 17/9 + 1/9)

 = 3 + 2 + 2

= 7

Bài 2)

x = 3/4 + 4/5

x = 31/20

 

y = 27/16 - 5/4

x = 7/16

 

Bài 3)

= 1634 x ( 63 + 37)

= 1634 x 100

= 163400

 

Answer 3

x - 4/5 = 3/4

x         = 3/4 + 4/5

x         = 31/20.

27/16 - y = 5/4

            y = 27/16 - 5/4

            y = 7/16

x . 5/6 = 3/2

x         = 3/2 : 5/6

x         = 9/5

4/7 . x = 15/28

        x = 4/7 . 15/28

        x = 15/49