а) ....=12 13/37+11 11/17+13 25/37+14 6/17=(12 13/37+13 25/37)+(11 11/17+14 6/17)=25 38/37+25 17/17=26 1/37+26=42 1/37
б) .....=(25 13/27+21 5/9)+(12 4/19+13 15/19)=(25 13/27+21 15/27)+25 19/19=46 28/27+26=47 1/27+26=73 1/27
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а) ....=12 13/37+11 11/17+13 25/37+14 6/17=(12 13/37+13 25/37)+(11 11/17+14 6/17)=25 38/37+25 17/17=26 1/37+26=42 1/37
б) .....=(25 13/27+21 5/9)+(12 4/19+13 15/19)=(25 13/27+21 15/27)+25 19/19=46 28/27+26=47 1/27+26=73 1/27