c) 2y ³ + 8y ² + 8y d) x ³ – 64x e) 8a ²xy – 18b ²xy f) 32a ³b ³ – 4 g) x ² – 49z ² – 4xy + 4y ² h) 3x ² + 6x + 3 – 3y ² i) 12x ²y – 12y ³ + 36xy + 27

Bởi

c) 2y ³ + 8y ² + 8y
d) x ³ – 64x
e) 8a ²xy – 18b ²xy
f) 32a ³b ³ – 4
g) x ² – 49z ² – 4xy + 4y ²
h) 3x ² + 6x + 3 – 3y ²
i) 12x ²y – 12y ³ + 36xy + 27y

0 bình luận về “c) 2y ³ + 8y ² + 8y d) x ³ – 64x e) 8a ²xy – 18b ²xy f) 32a ³b ³ – 4 g) x ² – 49z ² – 4xy + 4y ² h) 3x ² + 6x + 3 – 3y ² i) 12x ²y – 12y ³ + 36xy + 27”

  2. @Meo_

    c) $2y^{3}$ + $8y^{2}$ + 8y

    = 2y($y^{2}$ + 4y + 4 )

    d) x ³ – 64x

    = x($x^{2}$ + 64 )

    e) 8a ²xy – 18b ²xy

    = 2xy( 4a ² – 9b ² )

    f) 32a ³b ³ – 4

    = 4(8a ³b ³ – 1 )

    g) x ² – 49z ² – 4xy + 4y ²

    = ( x ²  – 4xy + 4y ² ) – 49z ²

    = ( x – y ) ² – 49z²

    = ( x – y ) ² – ( 7z )²

    = ( x – y – 7z ) ( x – y + 7z )

    h) 3x ² + 6x + 3 – 3y ²

    = ( 3x ² + 6x + 3  ) – 3y ²

    = [ 3 ( x² + 2x + 1 ) ] – 3y ²

    = 3 ( x² + 2x + 1 – y ² )

    i) 12x ²y – 12y ³ + 36xy + 27y

    = ( 12x ²y – 12y ³ ) + ( 36xy + 27y )

    = 12y( x² – y² ) + 9(4x + 3)

    = 3 [ 4y( x² – y² ) + 3(4x + 3) ]

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