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

Toán Lớp 8: Tìm x biết: x ( 2x – 3 ) + ( 2x + 1 ) ( 5-x ) = 1

Toán Lớp 8: Tìm x biết:
x ( 2x – 3 ) + ( 2x + 1 ) ( 5-x ) = 1

Comments ( 2 )

  1. x ( 2x – 3 ) + ( 2x + 1 ) ( 5-x ) = 1
    => 2x² – 3x + (-2x² + 9x + 5) = 1
    => 6x + 5 = 1
    => 6x = -4
    => x = -2/3
     

  2. Giải đáp:
    x = (-2)/3
    Lời giải và giải thích chi tiết:
    x . ( 2x – 3 ) + ( 2x + 1 )( 5 – x ) = 1
    2x² – 3x + 2x . ( 5 – x ) + 1 . ( 5 – x ) = 1
    2x² – 3x + 10x – 2x² + 5 – x = 1
    ( 2x²- 2x² ) – ( 3x – 10x + x ) = – 4
    6x = – 4
    => x = (-4)/6
    => x = (-2)/3
    Vậy x = (-2)/3

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

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