2012/05/15 - 数学    No Comments

多項式の乗法公式 I （展開公式I）

  1. \( m(a\pm b)=ma\pm mb \) (複号同順)
  2. \( (a\pm b)^{2}=a^{2}\pm 2ab+b^{2} \) (複号同順)
  3. \( (a+b)(a-b)=a^{2}-b^{2} \)
  4. \( (x+a)(x+b)=x^{2}+(a+b)x+ab \)
  5. \( (ax+b)(cx+d)=acx^{2}+(bc+ad)x+bd \)
  6. \( (a\pm b)^{3}=a^{3}\pm 3a^{2}b+3ab^{2}\pm b^{3} \) (複号同順)

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