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: `(2x+1)(4x²-2x+1)-8x³+30=2x+7`

Toán Lớp 8: (2x+1)(4x²-2x+1)-8x³+30=2x+7

Comments ( 2 )

  1. (2x+1)(4x^2-2x+1)-8x^3+30=2x+7
    ⇒(2x)^3+1^3-8x^3+30-2x-7=0
    ⇒8x^3+1-8x^3+30-2x-7=0
    ⇒(8x^3-8x^3)+(-2x)+(1+30-7)=0
    ⇒-2x+24=0
    ⇒-2x=-24
    ⇒x=12
    Vậy x=12
    #owen
    $ @H $
     

  2. Giải đáp:+lời giải
     (2x+1)(4²-2x+1)-8x³+30=2x+7
    ⇔ (2x)³+1-8x³+30=2x+7
    ⇔8x³+1-8x³+30=2x+7
    ⇔2x+7=31
    ⇔2x=24
    ⇔x=24:2=12
    vậy x=12
    Teamlovesmath
     

Leave a reply

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

About Bảo Anh