-·(=_______
计算 2019 × 2020 × 2021 × 2022 + 1 - 2020 2 的结果是_____.
若 x - 1 x = - 2 ,则 x 2 - 1 x 2 的值为_____.
若 x + y = 3 5 - 2 , x - y = 3 2 - 5 ,则 xy = _____.
已知 y = x 2 - 2 5 x - 4 - x 2 - 2 4 - 5 x + 2 ,则 x 2 + y 2 = _____.
已知实数 m 满足 2019 - m + m - 2020 = m ,那么 m - 2019 2 = _____.