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+1 )(x mũ 2-x+1 )+(x-1)(x mũ 2 +x+1)

Toán Lớp 8: (x+1 )(x mũ 2-x+1 )+(x-1)(x mũ 2 +x+1)

Comments ( 2 )

  1. (x+1)(x^2-x+1)+(x-1)(x^2+x+1)
    = (x^3+1)+(x^3-1)
    = x^3+1+x^3-1
    = 2x^3

  2. $\text{(x+1).(}$$x^{2}-x+1)+(x-1).($ $x^{2}+x+1)$
    $\text{=(}$$x^{3}+$ $1^{3})+($ $x^{3}-$ $1^{3})$
    $\text{=}$$x^{3}+$ $1^{3}+$ $x^{3}-$ $1^{3}$
    $\text{=2}$$x^{3}$
    $\text{-HĐT:}$$A^{3}-$ $B^{3}=(A-B).($ $A^{2}+AB+$ $B^{2})$
    $\text{}$$A^{3}+$ $B^{3}=(A+B).($ $A^{2}-AB+$ $B^{2})$

Leave a reply

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