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

2 bình luận về “4 2/3x- 1 2/3 x +4/5=1/5 1-(2x+3/4)^2=-5/4”

1. 4 2/3x- 1 2/3 x +4/5=1/5

   14/3x – 5/3x = + 4/5 = 1/5

   3x = -3/5

   x = -1/5

   Vậy x = -1/5

   ———-

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

   (2x+3/4)^2 = 9/4

   TH1 : 2x + 3/4 = 3/2

   2x = 3/4

   x = 3/8

   TH2 : 2x + 3/4 = -3/2

   2x = -9/4

   x= -9/8

   Vậy x ∈ {3/8;(-9)/8}

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2. Giải đáp:

    

   Lời giải và giải thích chi tiết:

   4 2/3x – 1 2/3x + 4/5 = 1/5

   14/3x – 5/3x = 1/5 – 4/5

   3x = -3/5

   x = -3/5 : 3

   x = -1/5

   Vậy x = -1/5

   ——–

   1 – ( 2x + 3/4 )^2 = -5/4

   ( 2x + 3/4 )^2 = 1 – ( -5/4 )

   ( 2x + 3/4)^2 = 9/4

   ( 2x + 3/4 )^2 = (3/2)^2 hoặc ( -3/2 )^2

   TH1 : 2x + 3/4 = 3/2

   2x = 3/2 – 3/4

   2x = 3/4

   x = 3/4 : 2

   x = 3/8

   TH2: 2x + 3/4 = -3/2

   2x = -3/2 – 3/4 

   2x= -9/4

   x = -9/4 : 2

   x = -9/8

   Vậy x ∈ { 3/8 ; -9/8 }

   color{purple}{#Chớp}

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