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

Toán Lớp 8: (x^2-2x+y^2).(x-y) Giúp mình bài này

Toán Lớp 8: (x^2-2x+y^2).(x-y)
Giúp mình bài này

Comments ( 2 )

  1. Cách 1:
    (x^2-2x+y^2).(x-y)
    =x^2.x-x^2.y-2x.x-2x.(-y)+y^2.x-y^2.y
    =x^3-x^2y-2x^2+2xy+y^2x-y^3.

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

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