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

Toán Lớp 8: phân tích nhân tử x^2+2xy+y^2-2x-2y

Toán Lớp 8: phân tích nhân tử
x^2+2xy+y^2-2x-2y

Comments ( 2 )

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

  2. $x^{2}$+2xy+$y^{2}$-2x-2y 
    =($x^{2}$+2xy+$y^{2}$)-(2x+2y)
    =$(x+y)^{2}$-2(x+y)
    =(x+y)(x+y-2)

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

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