[ベスト] 1/2 x 1/2 as a fraction 239997-2 1/2 x 1 2/5 as a fraction

 The denominators are the same, compare the numerators (x2 − 2x − 1) = A(x2 1) B(x −1)(x2 1) (Cx D)(x −1)2 Let x = 1 −2 = 2A, A = − 1 Coefficients of x2 1 = A −B −2C