1949 * 1949 - 1950 * 1950 + 1951 * 1951 - 1952 * 1952 + 1499 * 1999 ji suan

1949 * 1949 - 1950 * 1950 + 1951 * 1951 - 1952 * 1952 + 1499 * 1999 ji suan

1949 * 1949 - 1950 * 1950 + 1951 * 1951 - 1952 * 1952 + 1499 * 1999 = (1949 + 1950) * (1949 - 1950) + (1951 + 1952) * (1951 + 1952) + + (1991 - 1952) * (1949 + 2000) * (1949 - 2000) - 2000 * * 2000 * * 2000 = 4000000 - (1949 + 1950 + 1951 + + 2000) = 4000000 - 102674 = 3897326 이 드디어 나 왔 다.