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+2) ³+x(x-x ²)-(x+1)(7x+5)-3 Mọi người giải giúp mình với ạ

Toán Lớp 8: (x+2) ³+x(x-x ²)-(x+1)(7x+5)-3
Mọi người giải giúp mình với ạ

Comments ( 2 )

  1. (x+2) ³+x(x-x ²)-(x+1)(7x+5)-3
    = x^3 + 6x^2 + 12x + 8 + x^2 – x^3 – ( 7x^2 + 5x + 7x + 5 ) – 3
    = x^3 + 6x^2 + 12x + 8 + x^2 – x^3 – ( 7x^2 + 12x + 5 ) – 3
    = x^3 + 6x^2 + 12x + 8 + x^2 – x^3 – 7x^2 – 12x – 5 – 3
    = ( x^3 – x^3 ) + ( 6x^2 + x^2 – 7x^2 ) + ( 12x – 12x) + ( 8 – 5 – 3 )
    = 0
    gửi bn mong bn cho mik 5 sao vs ctlhn nhé cảm ơn bn nhiều ><
     

  2. $ ( x+ 2 )^3 + x ( x – x^2 ) – ( x + 1 ) ( 7x+5 ) – 3 $
    $ = x^3 + 6x^2 + 12x + 8 + x^2 – x^3 – ( 7x^2 + 7x + 5x + 5 ) – 3 $
    $ = x^3 + 6x^2 + 12x + 8 + x^2 – x^3 – 7x^2 – 7x – 5x -5 – 3 $
    $ = 0 $
     

Leave a reply

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