Question

do cac ban giai duoc bai nay:

x/15=8/24

x-1/x+5=6/7

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

Answer 1

x / 15 = 8 / 24

24x    = 8 x 15

24x    = 120

    x    = 5

x - 1 / x + 5 = 6 / 7

7 ( x - 1 )    = 6 ( x + 5)

7x - 7         = 6x + 30

7x - 6x       = 30 + 7

x                = 37

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

3 ( 3x - 2 ) = - 5 ( 1 - 2x )

9x - 6        = -5 + 10 x

9x - 10x    = -5 + 6

-x              = 1

 x              = -1