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, AB, BC, CD, DE, EF, FA , , . .1. , , , D, E, F , AB, BC, CD, DE, EF, FA . .

????????????? ? ? ????????? ?????????? ?-??????????; ?? ????? ? ??????. ???????? ?????????????? ???????? ???????????. ?? ??????? 2 ?????????? ??????????????? ???D ? ????????????? ?1?2?3?4?5?6. ??????, ???????????? ?? ??????? 3, ?? ???????? ???????????????, ?.?. ????????? ??????? ?1?5 ? ?2?3 ?????

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, AB, BC, CD, DE, EF, FA , , . .1. , , , D, E, F , AB, BC, CD, DE, EF, FA . .

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    1. ?????????????? ?????????? ??????, ???????????? ?? ???????? AB, BC, CD, DE, EF, FA ???, ??? ??????? ??????? ?? ????? ?? ????? ??????, ? ????????? ??????? ?? ????? ????? ?????. ????? ?????? ?????????? ??????????????? (???.1). ????? ?, ?, ?, D, E, F ?????????? ?????????, ? ??????? AB, BC, CD, DE, EF, FA ????????? ??????????????. ????? ???? ???? ?????? ?????????? ?????????? ??????????????.

    2. ????????????? ? ? ????????? ?????????? ?-??????????; ?? ????? ? ??????. ???????? ?????????????? ???????? ???????????. ?? ??????? 2 ?????????? ??????????????? ???D ? ????????????? ?1?2?3?4?5?6. ??????, ???????????? ?? ??????? 3, ?? ???????? ???????????????, ?.?. ????????? ??????? ?1?5 ? ?2?3 ????? ????? ?????.

    3. ??? ??????? ??????????????, ????????????? ????? ???????, ?????????? ?????????. ???????, ??????????? ????? ??? ?????????? ???????, ?????????? ?????????? ??????????????. ????? ????????????? ????????? ????????? ?? ??? ?????, ???? ?? ??????? ?????????? ??????????, ? ?????? ??????? ???????? ??????????????. ?? ??????? 4 ?????????? ??????? ??????????????? ?????????. ??????, ????????? ?? ?????? ?????????????? ? ??? ?????????? ???????, ????? ???????? ???????????????.

    4. ???????? ?????????????

    5. ??????????????? ?????? ??????????????? ????? ?????? ???????, ?????? ??????? ? ??? ????????? (???. 7). ??? ????????? ??????? ???????????????? ?????????? ????????????????. ??? ???????, ?? ?????????? ?????????, ????? ?????????? ????????????????. ???????????????? ?????? ???????? ? ??????????. ?? ??????? 7,? ????????? ???????? ???????????????, ? ?? ??????? 7,? ??????????.

    6. ?????????????? ???????????????? ?????????? ???????????????, ? ???????? ??????????????? ??????? ??????? ???????????. ?? ??????? 8 ????????? ?????????????? ???D: AB ll CD, AB ll CD, AD ll BC. ?????????????? ???????? ???????? ?????????????????.

    7. 1. ? ??????????????? ??????????????? ??????? ????? ? ??????????????? ???? ?????. ?????????? ?????????????? ???D. ????????? ?? ????????? ??? ?? ??? ????????????: ??? ? ?D?. ??? ???????????? ????? ?? ??????? ? ???? ?????????? ????? (?? ????? ???????, ???? 1 = ???? 2 ? ???? 3 = ???? 4 ??? ??????? ??????? ???? ??? ??????????? ??????? ?? ???????????? ?????? ?? ? ?D, ?D ? ?? ??????????????). ??????? AB = CD, AD = BC ????B = ????D. ?????, ????????? ??????????? ????? 1 ? 2, 3 ? 4, ???????? ???? ? = ???? 1 + ???? 3 = ???? 2 + ???? 4 = ???? ?

    8. 2. ????????? ??????????????? ?????? ??????????? ??????? ???????. ????? ? ????? ??????????? ?????????? ?C ? ?D ??????????????? ???D ( ???. 10). ???????????? ??? ? ?OD ????? ?? ??????? ? ???? ?????????? ????? ( ?? = ?D ??? ??????????????? ??????? ???????????????, ???? 1 = ???? 2 ? ???? 3 = ???? 4 ??? ??????? ??????? ???? ??? ??????????? ???????????? ?????? ?? ? ?D ???????? ?? ? ?D ??????????????). ??????? ?? = ?? ? ?? = ?D, ??? ? ??????????? ????????.

    9. ???????? ???????????????. 1. ???? ? ???????????????? ??? ??????? ????? ? ???????????, ?? ???? ??????????????? ??????????????. 2. ???? ? ???????????????? ??????????????? ??????? ??????? ?????, ?? ???? ??????????????? ??????????????. 3. ???? ? ???????????????? ????????? ???????????? ? ?????? ??????????? ??????? ???????, ?? ???? ??????????????? ??????????????.

    10. ???????? ????????? ?????????? ???????????????, ? ???????? ??? ??????? ???????????, ? ??? ?????? ??????? ?? ???????????. ???????????? ??????? ???????? ?????????? ?? ???????????, ? ??? ?????? ??????? ???????? ?????????. ???????? ?????????? ??????????????, ???? ?? ??????? ??????? ?????. ????????, ???? ?? ????? ??????? ??????, ?????????? ?????????????.

    11. ????????????? ??????????????? ?????????? ??????????????, ? ???????? ??? ???? ??????. ??? ??? ????????????? ???????? ????????????????, ?? ?? ???????? ????? ?????????? ???????????????: ? ?????????????? ??????????????? ??????? ?????, ? ????????? ?????? ??????????? ??????? ???????.

    12. ???? ? ???????. ?????? ?????????? ??????????????, ? ???????? ??? ??????? ?????. ?. ?. ???? ???????? ????????????????, ?? ?? ???????? ????? ?????????? ????????????????. ????????? ????? ??????? ??????????????? ? ????? ??? ???? ???????. ????????? ?????????? ?????????????, ? ???????? ??? ??????? ?????. 1.??? ???? ???????? ?????? (???. 16, ?). 2. ????????? ???????? ?????, ??????? ???????????????, ?????? ??????????? ??????? ??????? ? ????? ???? ???????? ??????? (???. 16, ?).

    13. ?????????? ???? ???D (???. 15). ????????? ????????, ??? ??- ?D ? ?????? ????????? ????? ??????????????? ???? ????? ???????. ???????, ????????, ??? ???? ??? = ???? D??. ?? ??????????? ????? ?? = ?D, ??????? ??????????? ??D ??????????????. ??? ??? ???? ??????????????, ?? ??? ????????? ?????? ? ??????????? ??????? ???????. ?????????????, ?? ??????? ??????????????? ???????????? ??D, ? ??????, ?????? ? ??????????? ????? ????????????. ??????? ??- ?D ? ???? ??? = ???? D??.

    14. ?????? ? ??????????? ????????? ??? ????? ? ? ?1 ?????????? ????????????? ???????????? ?????? ?, ???? ??? ?????? ???????? ????? ???????? ??????? ??1 ? ??????????????? ? ???? (???. 18, ?). ?????? ????? ?????? ? ????????? ???????????? ????? ????. ?? ??????? 18, ? ????? ? ? ?1, N ? N1 ??????????? ???????????? ?????? b, ? ????? ? ??????????? ????? ???? ???????????? ???? ??????.

    15. ?????? ?????????? ???????????? ???????????? ?????? ?, ???? ??? ?????? ????? ?????? ???????????? ?? ????? ???????????? ?????? ? ????? ??????????? ???? ??????. ?????? ? ?????????? ???? ????????? ??????. ??????? ?????, ??? ?????? ???????? ?????? ??????????.

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