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

Toán Lớp 8: ( 2x-1 )( 4x^2+2x+1 ) – 4x(2x^2-3)

Toán Lớp 8: ( 2x-1 )( 4x^2+2x+1 ) – 4x(2x^2-3)

Comments ( 2 )

  1. ***Lời giải***
    ( 2x-1 )( 4x^2+2x+1 ) – 4x(2x^2-3)
    =8x^3-1 – 4x(2x^2-3)
    =8x^3-1-8x^3+12x
    =(8x^3-8x^3)-1+12x
    =12x-1

  2. Giải đáp:
     12x-1
    Lời giải và giải thích chi tiết:
    ( 2x-1 )( 4x²+2x+1 ) – 4x(2x²-3)
    = 8x³ + 4x² + 2x – 4x² – 2x – 1 – 4x(2x² – 3)
    = 8x³ – 1 – 4x(2x² – 3)
    = 8x³ – 1 – 8x³ + 12x
    = 12x – 1

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