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

Toán Lớp 8: Phân tích đa thức thành nhân tử: 9 – x^2 + 2xy – y^2

Toán Lớp 8: Phân tích đa thức thành nhân tử:
9 – x^2 + 2xy – y^2

Comments ( 2 )

  1.          @changg
           Xin ctrlhn       

    toan-lop-8-phan-tich-da-thuc-thanh-nhan-tu-9-2-2y-y-2

  2. 9-x^2+2xy-y^2
    =9-(x^2-2xy+y^2)
    =3^2-(x-y)^2
    =(2-x+y)(2+x-y)

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

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