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

Toán Lớp 8: Bài 1 Thực hiện phép tính a)(x-4)(x²-2x+3) b)(12x-5)(4x-1)-3x(16x-1)

Toán Lớp 8: Bài 1 Thực hiện phép tính
a)(x-4)(x²-2x+3)
b)(12x-5)(4x-1)-3x(16x-1)

Comments ( 2 )

  1. a)(x-4)(x^2-2x+3)
    =x(x^2-2x+3)-4(x^2-2x+3)
    =x^3-6x^2+11x-12
    b)(12x-5)(4x-1)-3x(16x-1)
    =12x(4x-1)-5(4x-1)-3x(16x-1)
    =48x^2-12x-20x+5-48x^2+3x
    =-29x+5
     

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

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