Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

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

Toán Lớp 8: x^ 3 +8-3x^ 2 -6x x^ 2 -6x+5 x^ 3 +2x-3x^ 2 -6

Toán Lớp 8: x^ 3 +8-3x^ 2 -6x
x^ 2 -6x+5
x^ 3 +2x-3x^ 2 -6

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     a) x^3 + 8 – 3x^2 – 6x
    = (x+2) (x^2-2x+4) – 3x (x+2)
    = (x+2) (x^2-2x+4-3x)
    = (x+2) (x^2-5x+4)
    = (x+2) (x^2-x-4x+4)
    = (x+2) (x-1) (x-4)
    b) x^2 – 6x + 5
    = x^2 – x – 5x + 5
    = x (x-1) – 5 (x-1)
    = (x-5) (x-1)
    c) x^3 + 2x – 3x^2 – 6
    = x^2 (x-3) + 2 (x-3)
    = (x^2+2) (x-3)

  2. Bạn kham khảo
    a)x^3+8-3x^2-6x
    =(x+2)(x^2-2x+4)-3x(x+2)
    =(x+2)(x^2-2x+4-3x)
    =(x+2)(x^2-5x+4)
    =(x+2)(x^2-x-4x+4)
    =(x+2)(x-1)(x-4)
    b)x^2-6x+5
    =x^2-x-5x+5
    =x(x-1)-5(x-1)
    =(x-5)(x-1)
    c)x^3+2x-3x^2-6
    =x^2(x-3)+2(x-3)
    =(x^2+2)(x-3)

Leave a reply

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