1/ A = x² + 2xy – 5x + 4y² – 5xy + 10y – xy 2/ M = (1 – 2x + x²)(1 + 2x) + (1 + 2x) + (1 + 2x + x²)(1 – 2x) – 6 (1 – x²) Nhan

1 bình luận về “1/ A = x² + 2xy – 5x + 4y² – 5xy + 10y – xy 2/ M = (1 – 2x + x²)(1 + 2x) + (1 + 2x) + (1 + 2x + x²)(1 – 2x) – 6 (1 – x²) Nhan”

1. $\color{pink}{\text{#Kin}}$

   $1/ A = x² + 2xy – 5x + 4y² – 5xy + 10y – xy$

   $    A = x² – 4xy + 4y² – 5x + 10y$

   $    A = (x – 2y)² – 5 (x – 2y)$

   $    A = 64 – 40$

   $    A = 24$

   $2/ M = (1 – 2x + x²)(1 + 2x) + (1 + 2x) + (1 + 2x + x²)(1 – 2x) – 6 (1 – x²)$

   $    M = 1 – 2x + x² + 2x – 4x² + 2x³ + 1 + 2x + x² – 2x – 4x² – 2x³ – 6 + 6x²$

   $    M = -4$

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