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http://www.liveinternet.ru/users/nelyager/post127750809/
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http://www.liveinternet.ru/users/olga_zaedinova/post223842547/ |
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http://py4ki.3dn.ru/forum/75-473-1
30 - 10 = 20 : 4 = 5 -
10 -
120 - (30 + 30) = 60 -
...........
60 : 2 = 30 - 1/2
L - 1,80 1/2 = 90
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