25bcde2be4c630eb3cef84e44780766a74910f553f3489d1575b7f5b9cd2f23ce70ca4f30cb61c0d9b3887

25bcde2be4c630eb3cef84e44780766a74910f553f3489d1575b7e5b9cd2f23cf09a9a82e4f1e3949e76c6

중학수학으로만 3줄풀이 시발