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(IP보기클릭)121.139.***.***
(IP보기클릭)180.182.***.***
잘 맞히셨습니다. 이런 문제를 푸는 방정식을 연립방정식이라고 하지요? 배운지 55년도 더 지난 까마득한 추억의 시절이 그립군요. | 18.05.26 08:44 | |
(IP보기클릭)27.1.***.***