1. Найдите сумму или разность: 1) а) 1/3 + 5/6; б) 5/7 − 1/14; в) 2 2/3 + 5 5/12. 2) а) 3/11 − 1/13; б) 7/20 + 2/3. 3) а) 5/34 − 41/51; б) 3 1/30 − 5 7/90; в) 3 2/15 − 1 1/7; г) 6 1/7 − 10 3/14.

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Accepted Answer

а) \(\frac{1}{3}+\frac{5}{6}=\frac{2}{6}+\frac{5}{6}=\frac{7}{6}=1\frac{1}{6}\).
б) \(\frac{5}{7}-\frac{1}{14}=\frac{10}{14}-\frac{1}{14}=\frac{9}{14}\).
в) \(2\frac{2}{3}+5\frac{5}{12}=7+\frac{8}{12}+\frac{5}{12}=7+\frac{13}{12}=8\frac{1}{12}\).
а) \(\frac{3}{11}-\frac{1}{13}=\frac{39}{143}-\frac{11}{143}=\frac{28}{143}\).
б) \(\frac{7}{20}+\frac{2}{3}=\frac{21}{60}+\frac{40}{60}=\frac{61}{60}=1\frac{1}{60}\).
а) \(\frac{5}{34}-\frac{41}{51}=\frac{15}{102}-\frac{82}{102}=-\frac{67}{102}\).
б) \(3\frac{1}{30}-5\frac{7}{90}=3\frac{3}{90}-5\frac{7}{90}=-2\frac{2}{45}\).
в) \(3\frac{2}{15}-1\frac{1}{7}=2+\frac{14}{105}-\frac{15}{105}=1\frac{104}{105}\).
г) \(6\frac{1}{7}-10\frac{3}{14}=6\frac{2}{14}-10\frac{3}{14}=-4\frac{1}{14}\).

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