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

Toán Lớp 8: (2x-3)mũ2-(4x+2)(x-3) đang gấp ạ

Toán Lớp 8: (2x-3)mũ2-(4x+2)(x-3) đang gấp ạ

Comments ( 2 )

  1. (2x-3)^2-(4x+2)(x-3)
    =(2x)^2-2.2x.3+3^2-(4x.x-4x.3+2.x-2.3)
    =4x^2-12x+9-4x^2+10x+6
    =(4x^2-4x^2)-(12x-10x)+(9+6)
    =-2x+15
     

  2. $( 2x – 3 )^{2}$ – $( 4x + 2 )( x – 3 )$
    $= 2x^{2} – 2 . 3 . 2x + 3^{2} – 4x( x – 3 ) – 2( x – 3 )
    = 2x^{2} – 12x + 9 – 4x^{2} + 12x – 2x + 6
    = -2x^{2} – 2x + 15 $
    XIN HAY NHẤT
     

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

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