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

Toán Lớp 8: Bài 1: Phân tích các đa thức sau thành nhân tử: a) 2x+10y b) $x^{2}$+xy+x c) 3 $x^{2}$ y-6xy+12x $y^{2}$ d) y (x-2)-2x (x-2) e) 2 $x

Toán Lớp 8: Bài 1: Phân tích các đa thức sau thành nhân tử:
a) 2x+10y
b) $x^{2}$+xy+x
c) 3 $x^{2}$ y-6xy+12x $y^{2}$
d) y (x-2)-2x (x-2)
e) 2 $x^{2}$ (x-2y) +xy (x-2y)
f) x (y-x)- 2y (y-x)

Comments ( 2 )

  1. a)2x+10y
    =2(x+5y)
    b)x²+xy+x
    =x(x+y+1)
    c)3x²y-6xy+12xy²
    =3xy(x-2+4y)
    d)y(x-2)-2x(x-2)
    =(x-2)(y-2x)
    e)2x²(x-2y)+xy(x-2y)
    =(x-2y)(2x²+xy)
    f)x(y-x)-2y(y-x)
    =(y-x)(x-2y)

  2. a)
    2x + 10y
    = 2(x + 5y)
    b)
    x^2 + xy + x
    = x(x + y + 1)
    c)
    3x^2y – 6xy + 12xy^2
    = 3xy(x – 2 + 4y)
    d)
    y(x – 2) – 2x(x – 2)
    = (x – 2)(y – 2x)
    e)
    2x^2(x – 2y) + xy(x – 2y)
    = (x – 2y)(2x^2 + xy)
    = x(x – 2y)(2x + y)
    f)
    x(y – x) – 2y(y – x)
    = (x – 2y)(y – x)

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