Question

[Nguyễn Hồ Hải Yến]

tim x

1/5+x=3/7+1/3

x-1/2=2/3-1/5

3/5 nhân x=2/7+1/4

7/8:x=1/6 nhân 2/3

Answer 1

[An Hoà]

1 / 5 + x = 3 / 7 + 1 / 3

1 / 5 + x = 16 /21

x            = 16 / 21 - 1 / 5

x            = 59 / 105

x - 1 / 2 = 2 / 3 - 1 / 5

x - 1 / 2 = 7 / 15

         x  = 7 / 15 + 1 / 2

         x  = 29 / 30

3 / 5 * x = 2 / 7+ 1 / 4

3 / 5 * x = 15 / 28

          x = 15 / 28 : 3 / 5

          x = 25 / 28

7 / 8 : x = 1 / 6 * 2 / 3

7 / 8 : x = 1 / 9

          x = 7 / 8 : 1 / 9

          x = 63 / 8