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

Toán Lớp 8: Phân tích đa thức thành nhân tử. x ³-x+y ³-y

Toán Lớp 8: Phân tích đa thức thành nhân tử.
x ³-x+y ³-y

Comments ( 2 )

  1. x³ – x + y³ – y 
    = ( x³ + y³ ) – ( x + y )
    = ( x + y ) ( x² – xy + y² ) – ( x + y )
    = ( x + y ) ( x² – xy + y² -1 )
     

  2. x³-x+y³-y 
    =(x³+y³)-(x+y)
    =(x+y)(x²-xy+y²)-(x+y)
    =(x+y)(x²-xy+y²-1)

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