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

Toán Lớp 8: Tìm x 6x^2 – ( 2x – 3 ) . ( 3x – 2 ) = 1

Toán Lớp 8: Tìm x
6x^2 – ( 2x – 3 ) . ( 3x – 2 ) = 1

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
      6x^2 – (2x-3)(3x-2) = 1
    -> 6x^2 – (6x^2 – 4x  -9x + 4) = 1
    -> 6x^2 – (6x^2 -13x  + 6)=1
    -> 6x^2 – 6x^2 – 13x + 6 = 1
    -> -13x  + 6  = 1
    -> -13x = 1 -6   
    -> -13x = -7
    -> x = 7/13 
    Vậy x=7/13

  2.     $6x^2 – ( 2x – 3 ) . ( 3x – 2 ) = 1^{}$
    ⇔$6x^2 – 6x^2 + 13x – 6 = 1^{}$
    ⇔$13x – 6 = 1^{}$ 
    ⇔$13x  = 7^{}$ 
    ⇔$x=\dfrac{7}{13}^{}$ 

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

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