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

Toán Lớp 8: Phân tích thành nhân tử: x2-x-y2-y

Toán Lớp 8: Phân tích thành nhân tử:
x2-x-y2-y

Comments ( 2 )

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

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

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