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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: Tìm x: a)4x(x-2)-(2x+1)^2=6-2x

Toán Lớp 8: Tìm x:

a)4x(x-2)-(2x+1)^2=6-2x

Comments ( 2 )

  1. Giải đáp+ Lời giải và giải thích chi tiết:
      a) 4x(x-2) -(2x+1)^2 = 6 -2x
    -> 4x^2 – 8x – (4x^2 + 4x + 1) =6 -2x
    -> 4x^2 – 8x – 4x^2 -4x – 1 = 6 – 2x
    -> 4x^2 – 8x – 4x^2 – 4x – 1 – 6 + 2x = 0
    -> (4x^2-4x^2) -(8x + 4x -2x) – (1+6)=0
    -> -10x – 7 = 0
    -> -10x =  7
    -> x = -7/10  

  2. 4x(x-2)-(2x+1)^2=6-2x
    ⇔4x^2-8x-4x^2-4x-1=6-2x
    ⇔(4x^2-4x^2)-(8x+4x)-1=6-2x
    ⇔-12x-1=6-2x
    ⇔-12x-1-6+2x=0
    ⇔-10x-7=0
    ⇔-10x=7⇒x=-7/10
     

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222-9+11+12:2*14+14 = ? ( )

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