3/5 – x = 5/7 3/4 – 2. (x-9) = 1/4 5/7 – 5/2 : (x-3) = 1 7/2 : ( x+4) -1/5 = 3 7/8 + 5/3 : (x-1)= 1/5

1 bình luận về “3/5 – x = 5/7 3/4 – 2. (x-9) = 1/4 5/7 – 5/2 : (x-3) = 1 7/2 : ( x+4) -1/5 = 3 7/8 + 5/3 : (x-1)= 1/5”

1. Giải đáp + Lời giải và giải thích chi tiết:

   3/5 – x = 5/7

   x = 3/5 – 5/7

   x = 21/35 – 25/35

   x = -4/35

   Vậy x = -4/35

   3/4 – 2 . ( x – 9 ) = 1/4

   2 . ( x – 9 ) = 3/4 – 1/4

   2 . ( x – 9 ) = 1/2

   x – 9 = 1/2 : 2

   x – 9 = 1/2 . 1/2

   x – 9 = 1/4

   x = 1/4 + 9

   x = 1/4 + 36/4

   x = 37/4

   Vậy x = 37/4

   5/7 – 5/2 : ( x – 3 ) = 1

   5/2 : ( x – 3 ) = 5/7 – 1

   5/2 : ( x – 3 ) = 5/7 – 7/7

   5/2 : ( x – 3 ) = -2/7

   x – 3 = 5/2 : -2/7

   x – 3 = 5/2 . -7/2

   x – 3 = -35/4

   x = -35/4 + 3

   x = -35/4 + 12/4

   x = -23/4

   Vậy x = -23/4

   7/2 : ( x + 4 ) – 1/5 = 3

   7/2 : ( x + 4 ) = 3 + 1/5

   7/2 : ( x + 4 ) = = 15/5 + 1/5

   7/2 : ( x + 4 ) = 16/5

   x + 4 = 7/2 : 16/5

   x + 4 = 7/2 . 5/16

   x + 4 = 35/32

   x = 35/32 – 4

   x = 35/32 – 128/32

   x = -93/32

   Vậy x = -93/32

   7/8 + 5/3 : ( x – 1 ) = 1/5

   5/3 : ( x – 1 ) = 1/5 – 7/8

   5/3 : ( x – 1 ) = 8/40 – 35/40

   5/3 : ( x – 1 ) = -27/40

   x – 1 = 5/3 : -27/40

   x – 1 = 5/3 . -40/27

   x – 1 = -200/81

   x = -200/81 + 1

   x = -200/81 + 81/81

   x = -119/81

   Vậy x = -119/81

   Trả lời