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: A=(3x^2-2x+1)(x^2+2x+3)-4x(x^2-1)-3x^2(x^2+2)

Toán Lớp 8: A=(3x^2-2x+1)(x^2+2x+3)-4x(x^2-1)-3x^2(x^2+2)

Comments ( 1 )

  1. A= $(3x²-2x+1)(x²+2x+3)-4x(x²-1)-3x²(x²+2)$
    = $3x^{4}$ – $2x^{3}$ + $x^{2}$ + $6x^{3}$ – $4x^{2}$ +$2x$ + $9x^{2}$ – $6x$ + $3$ – $4x^{3}$ + $4x$ – $3x^{4}$ – $6x^{2}$ + $3$
    = ($3x^{4}$ – $3x^{4}$ )- ($2x^{3}$ – $6x^{3}$  + $4x^{3}$) +($x^{2}$  – $4x^{2}$ + $9x^{2}$ – $6x^{2}$) + ( $2x$  + $4x$ – $6x$) + $3$
    =$3$
    Vậy A không phụ thuộc vào biến x

Leave a reply

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