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 các biểu thức sau (x ²- 3)(x mũ 4 +3x ²+9) (2x-1)(4x ²+2x+1)

Toán Lớp 8: rút gọn các biểu thức sau
(x ²- 3)(x mũ 4 +3x ²+9)
(2x-1)(4x ²+2x+1)

Comments ( 2 )

  1. $\\$
    Bạn tham khảo bài.
    (x^2 – 3)(x^4 + 3x^2 + 9)
    = (x^2-3)[(x^2)^2 + 3x^2 + 3^2]
    = (x^2)^3 – 3^3
    = x^6 – 27
    (2x-1)(4x^2 +2x+1)
    = (2x-1)[(2x)^2 + 2x.1+1^2]
    = (2x)^3 – 1^3
    = 8x^3 – 1
     

  2. a) (x^2-3)(x^4+3x^2+9)
    =(x^2-3)[(x^2)^2+3.x^2+3^2]
    =(x^2)^3-3^3
    =x^6-27
    b) (2x-1)(4x^2+2x+1)
    =(2x-1)[(2x)^2+2.x+1^2]
    =(2x)^3-1^3
    =8x^3-1
     

Leave a reply

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