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

Toán Lớp 8: Phân tích : 2x^3 + 3x^2 – 8x + 3

Toán Lớp 8: Phân tích :
2x^3 + 3x^2 – 8x + 3

Comments ( 1 )

  1. 2x^3 + 3x^2 – 8x + 3
    = 2x^3 – 2x^2 + 5x^2 – 5x – 3x + 3
    = 2x^2 ( x – 1 ) + 5x( x – 1 ) – 3( x – 1 )
    = ( 2x^2 + 5x – 3 )( x – 1 )
    = ( 2x^2 + 6x – x – 3 )( x – 1 )
    = [2x( x + 3 ) – ( x + 3 )]( x – 1 )
    = ( 2x – 1 )( x + 3 )( x – 1 )
     

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