Kudo Shinichi (THCS Hoàng Diệu)
Giới thiệu
\((a + b)^2\) = \(a^2\) + 2ab + \(b^2\)
\((a - b)^2\) = \(a^2\) - 2ab + \(b^2\)
\(a^2\) - \(b^2\) = (a - b)(a + b)
\((a + b)^3\) = \(a^3\) + 2\(a^2\)b + 2a\(b^2\) + \(b^3\)
\((a - b)^3\) = \(a^3\) - 2\(a^2\)b + 2a\(b^2\) - \(b^3\)
\(a^3\) + \(b^3\) = (a + b)(\(a^2\) - ab + \(b^2\))
\(a^3\) - \(b^3\) = (a - b)(\(a^2\) + ab + \(b^2\))