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: Phân tích đa thức thành nhân tử : x ³-x+3x ²y-y+3xy ²+y ³

Toán Lớp 8: Phân tích đa thức thành nhân tử :
x ³-x+3x ²y-y+3xy ²+y ³

Comments ( 2 )

  1. x³ – x + 3x²y – y + 3xy² + y³
    = x³ + 3x²y + 3xy² + y³ – x – y
    = (x + y)³ – (x + y)
    = (x + y)² . (x + y) – (x + y)
    = (x + y) . [(x + y)² – 1]
    = (x + y) . [(x + y)² – 1²]
    = (x + y)² . (x + y – 1) . (x + y + 1)

  2. \qquad x^3-x+3x^2y-y+3xy^2+y^3
    =(x^3+3x^2y+3xy^2+y^3)-(x+y)
    =(x+y)^3-(x+y)
    =(x+y)[(x+y)^2-1]
    =(x+y)(x+y-1)(x+y+1)

Leave a reply

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

About Khánh Ly