 .  .  C_1 4 x^5 y^2 - 5 x^3 y + 7 x^3 y + 2 a x^5 y^2  = ( 4 x y^2 + 2 a a^5 y^2 ) + ( - 5 x^3 y^2 + 7 x^2 .  .   = ( 4 x y^2 + 2 a x^5 y^2 ) + ( - 5 x^3 y + 7 x^3 y  )   = ( 4 +

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 ⇒ a = - 2 Cail 1:   e^- 2 da this of bac  4 + 2 a = 0 thi :  = 4   .  P = M + N = 5 x^2 y - x y^2 - x y + 7 x^3 + y - 2 x y^2 - 3 x y + 1   = 7 x^3 + 5 x^2 y - 3 x y^2 - 4 x y + y

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