tìm x b, 1/4 -3x =1/5 -4x c, 1/3 -x= 1/4 – 7x d, 4. (1/3 -x )+1/2=5/6 +x

2 bình luận về “tìm x b, 1/4 -3x =1/5 -4x c, 1/3 -x= 1/4 – 7x d, 4. (1/3 -x )+1/2=5/6 +x”

1. Giải đáp:

   b) 1/4 – 3x = 1/5 – 4x

   <=> -3x+4x=1/5-1/4

   <=> x=(-1)/20

   Vậy x=(-1)/20

   c) 1/3 -x =1/4 – 7x

   <=> -x+7x=1/4-1/3

   <=> 6x=(-1)/12

   <=> x=(-1)/12 : 6

   <=> x=(-1)/72

   Vậy x=(-1)/72

   d) 4 ( 1/3 -x )+1/2=5/6 + x

   <=> 4/3 – 4x + 1/2=5/6+x

   <=> -4x-x=5/6-1/2-4/3

   <=> -5x=-1

   <=> x=1/5

   Vậy x=1/5

   #loanluyendh

   Trả lời
2. b, 1/4 – 3x = 1/5 – 4x

   <=> -3x + 4x = 1/5 – 1/4

   <=> x = (-1)/(20)

   Vậy x = (-1)/(20)

   c, 1/3 – x = 1/4 -7x

   <=> -x + 7x = 1/4 – 1/3

   <=> 6x = (-1)/(12)

   <=> x = (-1)/(12) : 6

   <=> x = (-1)/(72)

   Vậy x = (-1)/(72)

   d, 4(1/3 – x) + 1/2 = 5/6 + x

   <=> 4/3 – 4x + 1/2 = 5/6 + x

   <=> (11)/6 – 4x = 5/6 + x

   <=> -4x – x = 5/6 – (11)/6

   <=> -5x = -1

   <=> x = 1/5

   Vậy x = 1/5

   $#nhuy1382006$

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