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

Toán Lớp 8: x mũ 2 + y mũ 2 + 2x – 2y – 2xy đặt nhân tử chung

Toán Lớp 8: x mũ 2 + y mũ 2 + 2x – 2y – 2xy đặt nhân tử chung

Comments ( 2 )

  1. x^2 + y^2 + 2x – 2y – 2xy
    = x^2 – 2xy + y^2 + 2 ( x – y )
    = (x-y)^2 + 2 ( x – y )
    = (x – y) ( x – y +2 )

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

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