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

Toán Lớp 8: Phân tích các đa thức sau thành nhân tử: a) x ³-2x ² b) y ²+2y-x ²+1 c) x ²-x-6

Toán Lớp 8: Phân tích các đa thức sau thành nhân tử:
a) x ³-2x ²
b) y ²+2y-x ²+1
c) x ²-x-6

Comments ( 2 )

  1. a, x^3 – 2x^2
    = x^2(x – 2)
    b, y^2 + 2y – x^2 + 1
    = (y + 1)^2 – x^2
    = (y + 1 – x)(y + 1 + x)
    c, x^2 – x – 6
    = x^2 – 3x + 2x – 6
    = x(x + 2) – 3(x + 2)
    = (x + 2)(x – 3)

  2. $a,$
    $x^3- 2x^2$
    $= x^2(x – 2)$
    $b,$
    $y^2 + 2y – x^2 + 1$
    $= y^2 + 2y + 1 – x^2$
    $= (y + 1)^2 – x^2$
    $= (y + 1 – x)(y + 1 + x)$
    $c,$
    $x^2 – x – 6$
    $= x^2 + 2x – 3x – 6$
    $= x(x + 2) – 3(x + 2)$
    $= (x + 2)(x – 3)$

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