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

Toán Lớp 8: (x^3 – 7x – x^2 + 3) : ( x – 3)

Toán Lớp 8: (x^3 – 7x – x^2 + 3) : ( x – 3)

Comments ( 2 )

  1. $x^3-7x-x^2+3$
    $=x^3-x^2-7x+3$
    $=x^3-3x^2+2x^2-6x-x+3$
    $=x^2(x-3)+2x(x-3)-(x-3)$
    $=(x-3)(x^2+2x-1)$
    Chia cho x-3
    $=\dfrac{(x-3)(x^2+2x-1)}{x-3}$
    $=x^2+2x-1$
    Chúc bạn học tốt !!!!!!

  2. Giải đáp:
    =x^2+2x-1
    Lời giải và giải thích chi tiết:
    (x^3-7x-x^2+3) : (x-3)
    =[(x^3-3x^2)+(2x^2-6x)-(x-3)] : (x-3)
    =[x^2(x-3)+2x(x-3)-(x-3)] : (x-3)
    =(x^2+2x-1)(x-3) : (x-3)
    =x^2+2x-1

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