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

Toán Lớp 8: Phan tichs nhan tu 25 – x mu 2 – y mu 2 – 2xy

Toán Lớp 8: Phan tichs nhan tu
25 – x mu 2 – y mu 2 – 2xy

Comments ( 2 )

  1.     25-x^2-y^2-2xy
    = 25-(x^2+2xy+y^2)
    = 5^2-(x+y)^2
    = (5-x-y)(5+x+y)

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

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