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

Toán Lớp 8: Bài 2: Phân tích các đa thức sau thành nhân tử i) (y – 1) – x (1 – y) = = j) 3 (a – b) 2 + 6x (a – b) = = k) 5x (x + y) – 10y (x + y)

Toán Lớp 8: Bài 2: Phân tích các đa thức sau thành nhân tử
i) (y – 1) – x (1 – y)
=
=
j) 3 (a – b) 2 + 6x (a – b)
=
=
k) 5x (x + y) – 10y (x + y)
=
=
l) x (x – y) – y (y – x)
=
=
m) x (a – 1) + y(1 – a)
=
=
n) (x + 3) (x + 2) + (x + 3)
=
=
mong các bạn giúp đỡ ạ

Comments ( 2 )

  1. i)
    (y – 1) – x(1 – y)
    = (y – 1) + x(y – 1)
    = (x + 1)(y – 1)
    j)
    3(a – b)^2 + 6x(a – b)
    = 3(a – b)[(a – b) + 2x]
    k)
    5x(x + y) – 10y(x + y)
    = 5(x + y)(x – 2y)
    l)
    x(x – y) – y(y – x)
    = x(x – y) + y(x – y)
    = (x + y)(x – y)
    m)
    x(a – 1) + y(1 – a)
    = x(a – 1) – y(a – 1)
    = (x – y)(a – 1)
    n)
    (x + 3)(x + 2) + (x + 3)
    = (x + 3)(x + 3)
    = (x + 3)^2

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