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 a)X^2 –xy + 3x -3y b) 2xy-4x^2 c) x^2 -4x+2xy -8y d) y^2 +2xy + x^2 – 9 e) x^2y –x+2xy-2 f) y^3 -4x^2

Toán Lớp 8: Phân tích đa thức thành nhân tử
a)X^2 –xy + 3x -3y
b) 2xy-4x^2
c) x^2 -4x+2xy -8y
d) y^2 +2xy + x^2 – 9
e) x^2y –x+2xy-2
f) y^3 -4x^2 – 2y+1
g) x^3 +5x
h) x^2 +2x +1
m) x^2 -4x+4-y^2
n) x^2 -2x+xy- 2y
p) x^2 -y^2 -2x- 2y
o) 7x^3y – 3xyz – 21x^2 +9z
s) xy + 3x -7y -21
t) x^2y +xy +x + 1
i) x^3 -2X^2 +2x -1

Comments ( 2 )

  1. e) x^2y-x+2xy-2
    = x(xy-1)+2(xy-1)
    = (x+2)(xy-1)
    g) x^3+5x
    = x(x^2+5)
    m) x^2-4x+4-y^2
    = (x-2)^2-y^2
    = (x-2-y)(x-2+y)
    n) x^2-2x+xy-2y
    = x(x-2)+y(x-2)
    = (x+y)(x-2)
    s) xy+3x-7y-21
    = x(y+3)-7(y+3)
    = (x-7)(y+3)
    t) x^2y+xy+x+1
    = xy(x+1)+(x+1)
    = (xy+1)(x+1)
    i) x^3-2x^2+2x-1
    = x^3-x^2+x-x^2+x-1
    = x(x^2-x+1)-(x^2-x+1)
    = (x-1)(x^2-x+1)

  2. Giải đáp:
    ↓↓
    Lời giải và giải thích chi tiết:
    a)
    x^2 – xy + 3x – 3y
    = x(x – y) + 3(x – y)
    = (x + 3)(x – y)
    b)
    2xy – 4x^2
    = 2x(y – 2x)
    c)
    x^2 – 4x + 2xy – 8y
    = (x – 4)(2y + x)
    d)
    y^2 + 2xy + x^2 – 9
    = (x + y)^2 – 3^2
    = (x + y + 3)(x + y – 3)
    e)
    x^2y-x+2xy-2
    = x(xy-1)+2(xy-1)
    = (x+2)(xy-1)
    f)
    y^3 – 4x^2 – 2y + 1
    = y^3 – 2y – 4x^2 + 1
    g)
    x^3+5x
    = x(x^2+5)
    m)
    x^2-4x+4-y^2
    = (x-2)^2-y^2
    = (x-2-y)(x-2+y)
    n)
    x^2-2x+xy-2y
    = x(x-2)+y(x-2)
    = (x+y)(x-2)
    s)
    xy+3x-7y-21
    = x(y+3)-7(y+3)
    = (x-7)(y+3)
    t)
    x^2y+xy+x+1
    = xy(x+1)+(x+1)
    = (xy+1)(x+1)
    i)
    x^3-2x^2+2x-1
    = x^3-x^2+x-x^2+x-1
    = x(x^2-x+1)-(x^2-x+1)
    = (x-1)(x^2-x+1).

Leave a reply

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