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

Toán Lớp 8: rút gọn : (2x-y)(4x^2+2xy+y^2)

Toán Lớp 8: rút gọn :
(2x-y)(4x^2+2xy+y^2)

Comments ( 2 )

  1.    ( 2x – y )( 4x^2 + 2xy + y^2 )
    = ( 2x – y )[ (2x)^2 + 2xy + y^2 ]
    = (2x)^3 – y^3
    = 8x^3 – y^3

  2. (2x-y)(4x^2+2xy+y^2)
    = 8x^3 – y^3
     

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