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: rút gọn biểu thức A=(x^2-2) (x+3)- (x-3) (x^2+3x+9)

Toán Lớp 8: rút gọn biểu thức
A=(x^2-2) (x+3)- (x-3) (x^2+3x+9)

Comments ( 2 )

  1. (x^2-2)(x+3)-(x-3)(x^2+3x+9)
    =x^3+3x^2-2x-6-(x^3-3^3)
    =x^3+3x^2-2x-6-x^3+27
    =(x^3-x^3)+3x^2-2x+(27-6)
    =3x^2-2x+21
     

  2. A=(x^2-2)(x+3)-(x-3)(x^2+3x+9)
    A=x^{2}.x+x^{2}.3-2.x-2.3-(x^3-27)
    A=x^3+3x^2-2x-6-x^3+27
    A=3x^2-2x+21
     

Leave a reply

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

About Khanh