Вопрос:

1. Найдите сумму или разность: 1) а) \(\frac{1}{3}+\frac{5}{6}\); б) \(\frac{5}{7}-\frac{1}{14}\); в) \(2\frac{2}{3}+5\frac{5}{12}\). 2) а) \(\frac{3}{11}-\frac{1}{13}\); б) \(\frac{7}{20}+\frac{2}{3}\); в) \(3\frac{2}{15}-1\frac{4}{7}\). 3) а) \(\frac{5}{34}-\frac{41}{51}\); б) \(3\frac{1}{30}-5\frac{7}{90}\); в) \(6\frac{1}{7}-10\frac{3}{14}\).

Ответ:

1) 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) \(2\frac{2}{3}+5\frac{5}{12}=2\frac{8}{12}+5\frac{5}{12}=7\frac{13}{12}=8\frac{1}{12}\).

2) а) \(\frac{3}{11}-\frac{1}{13}=\frac{39-11}{143}=\frac{28}{143}\).

б) \(\frac{7}{20}+\frac{2}{3}=\frac{21+40}{60}=\frac{61}{60}=1\frac{1}{60}\).

в) \(3\frac{2}{15}-1\frac{4}{7}=\frac{47}{15}-\frac{11}{7}=\frac{329-165}{105}=\frac{164}{105}=1\frac{59}{105}\).

3) а) \(\frac{5}{34}-\frac{41}{51}=\frac{15-82}{102}=-\frac{67}{102}\).

б) \(3\frac{1}{30}-5\frac{7}{90}=\frac{91}{30}-\frac{457}{90}=\frac{273-457}{90}=-\frac{184}{90}=-\frac{92}{45}=-2\frac{2}{45}\).

в) \(6\frac{1}{7}-10\frac{3}{14}=\frac{85}{14}-\frac{143}{14}=-\frac{58}{14}=-\frac{29}{7}=-4\frac{1}{7}\).

Ответ: 1) а) \(1\frac{1}{6}\); б) \(\frac{9}{14}\); в) \(8\frac{1}{12}\). 2) а) \(\frac{28}{143}\); б) \(1\frac{1}{60}\); в) \(1\frac{59}{105}\). 3) а) \(-\frac{67}{102}\); б) \(-2\frac{2}{45}\); в) \(-4\frac{1}{7}\).