First simplify, then evaluate A-1 / A + 2 × a ^ 2-4 / A ^ 2-2a + 1 △ 1 / A ^ 2-1, where a satisfies a ^ 2-A = 0 (A-1 / A + 2) × (a ^ 2-4 / A ^ 2-2a + 1) / (1 / A ^ 2-1), where a satisfies a ^ 2-A = 0

First simplify, then evaluate A-1 / A + 2 × a ^ 2-4 / A ^ 2-2a + 1 △ 1 / A ^ 2-1, where a satisfies a ^ 2-A = 0 (A-1 / A + 2) × (a ^ 2-4 / A ^ 2-2a + 1) / (1 / A ^ 2-1), where a satisfies a ^ 2-A = 0

Because a ^ 2-A = 0, so a ^ 2 = a, substitute into the following formula: the original formula = A-1 / A + 2 × a ^ 2-4 / A ^ 2-2a + 1 △ 1 / A ^ 2-1 = A-1 / A + 2 * A-4 / a-2a + 1 △ 1 / A-1 = A-1 / a + 2a-4 / a-2a + A-1 = 2a-5 / A-1 because a ^ 2-A = 0, so a = 0 or a = 1 (1) when a = 0, 1 / A is meaningless, so a cannot be equal to 0