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 các đa thức sau thành nhân tử: a. 3x – 6xy b. x2- 4x + 4 c) x3 + 5×2 + 6x d) x2 +

Toán Lớp 8: : Phân tích các đa thức sau thành nhân tử:
a. 3x – 6xy b. x2- 4x + 4 c) x3 + 5×2 + 6x
d) x2 + 3x + 3y + xy e) x2 – 10x +9 k) x2 – xy + x – y
h) x2 – y2 – 2x + 2y m) 5×3 – 10x2y + 5xy2

Comments ( 2 )

  1. Giải đáp:
    a, 3x – 6xy
    = 3x.(1 – 2y)
    ———–
    b, x^2 – 4x + 4
    = x^2 – 2.x.2 +2 ^2
    = (x – 2)^2
    ————
    c, x^3 + 5x^2 + 6x
    = x.(x^2 + 5x + 6)
    = x.(x^2 + 2x + 3x + 6)
    = x.[x.(x + 2) + 3.(x + 2)]
    = x.(x + 2).(x + 3)
    ————-
    d, x^2 + 3x + 3y + xy
    = (x^2 + xy) + (3x + 3y)
    = x.(x + y) + 3.(x + y)
    = (x + y).(x  +3)
    ————-
    e, x^2 – 10x + 9
    = x^2 – 9x – x + 9
    = x.(x – 9) – (x – 9)
    = (x – 9).(x – 1)
    ————-
    k, x^2 – xy + x – y
    = x.(x – y)  + (x – y)
    = (x – y).(x + 1)
    ————-
    h, x^2 – y^2 – 2x + 2y
    = (x – y).(x + y) – 2.(x – y)
    = (x – y).(x + y – 2)
    ————–
    m, 5x^3 – 10x^2y + 5xy^2
    = 5x.(x^2 – 2xy  + y^2)
    = 5x.(x – y)^2
    #dariana 

Leave a reply

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