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

Toán Lớp 8: Thực hiện phép tính (x+y)(x+xy+y)

Toán Lớp 8: Thực hiện phép tính
(x+y)(x+xy+y)

Comments ( 2 )

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

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

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

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