Ответ:
1,2/а=0,6/21 ;
6/5а = 1/35 ;
210 = 5а ;
5а = 210 ;
а = 42 .
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Ответ:
1,2/а=0,6/21 ;
6/5а = 1/35 ;
210 = 5а ;
5а = 210 ;
а = 42 .