Tìm x: a) 13/12 x x - 5/6 = 4/3 b) x x 7/15 = 4/5 + 2/3 c) 9/2 - x = 4/3 - 1/2 d) x : 8/17 = 5 + 2/3

Tìm x:

a) 13/12 x x - 5/6 = 4/3

    13/12 x x          = 4/3 + 5/6

    13/12 x x          = 16/12 + 10/12

    13/12 x x          = 26/12

                 x          = 26/12 : 13/12

                 x          = 26/12 x 12/13

                 x          = 2

b) x x 7/15 = 4/5 + 2/3

    x x 7/15 = 12/15 + 10/15

    x x 7/15 = 22/15

    x            = 22/15 : 7/15

    x            = 22/15 : 15/7

    x            = 22/7

c) 9/2 - x = 4/3 - 1/2

    9/2 - x = 8/6 - 3/6

    9/2 - x = 5/6

             x = 9/2 - 5/6

             x = 27/6 - 5/6

             x = 22/6 = 11/3

d) x : 8/17 = 5 + 2/3

    x : 8/17 = 15/3 + 2/3

    x : 8/17 = 17/3

    x           = 17/3 x 8/17

    x           = 8/3