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

Toán Lớp 8: Rút gọn biểu thức : (2x+1)(4x²-2x+1)+(3-2x)(9+6x+4x²)

Toán Lớp 8: Rút gọn biểu thức : (2x+1)(4x²-2x+1)+(3-2x)(9+6x+4x²)

Comments ( 2 )

  1. ( 2x + 1)( 4x^{2} – 2x + 1) + ( 3 – 2x)( 9 + 6x + 4x^{2} )
    = 8x^{3} + 1 + 27 – 8x^{3}
    = 28

  2. Giải đáp:
    (2x+1)(4x²-2x+1)+(3-2x)(9+6x+4x²)
    = 8x^3 + 1 + 27 – 8x^3
    = ( 8x^3 – 8x^3) + ( 1 + 27)
    = 28
    Áp dụng HĐT:
    a^3 + b^3 = ( a+b)( a^2 – ab + b^2)
    a^3 – b^3 = ( a-b)( a^2 +ab + b^2)

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