a) 8/15 . x +5/7 = -1/21 b)(5x +3/2) : 8/15 +5/6 =2 1/12 c) x-40%x=-0,6 mình vote 5* nhé

0 bình luận về “a) 8/15 . x +5/7 = -1/21 b)(5x +3/2) : 8/15 +5/6 =2 1/12 c) x-40%x=-0,6 mình vote 5* nhé”

1. a) `8/15 .x + 5/7 = -1/21`

   `8/15 .x = -1/21 – 5/7`

   `8/15 .x = -16/21`

   `x = -16/21 : 8/15`

   `x = -10/7`

   b) `(5x+3/2 ) : 8/15 + 5/6 = 2 1/12`

   `(5x+3/2) : 8/15 = 25/12 – 5/6`

   `(5x+3/2) : 8/15 = 5/4`

   `5x + 3/2 = 5/4 . 8/15`

   `(5x+3/2)  = 2/3`

   `5x = 2/3 – 3/2`

   `5x = -5/6`

   `x = -5/6 : 5

   `x = -1/6`

   c) `x – 40% .x = -0,6`

   `(1 – 2/5) .x = -0,6`

   `3/5 x = -0,6`

   `x= -0,6 : 3/5`

   `x=-1`

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2. a, 8/15*x=-16/21

   x=-10/7

   b,(5x+3/2):8/15=5/3

   5x+3/2=8/9

   5x=-11/8

   x=-11/90

   c,x-40%x=-0,6

   60%x=-0,6

   x=-1

    

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