a) 4 \( \frac{5}{17} \) + \( \frac{8}{17} \) ; б) 3 \( \frac{5}{21} \) + 4 \( \frac{8}{21} \) ; в) 13 + 12 \( \frac{11}{12} \) ; г) 9 \( \frac{5}{6} \) + 7 ; д) 3 \( \frac{12}{23} \) + 4 \( \frac{11}{23} \) ; е) 7 \( \frac{15}{19} \) + 4 \( \frac{14}{19} \)

Решение:

• a) \( 4 \frac{5}{17} + \frac{8}{17} = 4 + \frac{5+8}{17} = 4 + \frac{13}{17} = 4 \frac{13}{17} \)
• б) \( 3 \frac{5}{21} + 4 \frac{8}{21} = (3+4) + \frac{5+8}{21} = 7 + \frac{13}{21} = 7 \frac{13}{21} \)
• в) \( 13 + 12 \frac{11}{12} = 25 \frac{11}{12} \)
• г) \( 9 \frac{5}{6} + 7 = (9+7) + \frac{5}{6} = 16 \frac{5}{6} \)
• д) \( 3 \frac{12}{23} + 4 \frac{11}{23} = (3+4) + \frac{12+11}{23} = 7 + \frac{23}{23} = 7 + 1 = 8 \)
• е) \( 7 \frac{15}{19} + 4 \frac{14}{19} = (7+4) + \frac{15+14}{19} = 11 + \frac{29}{19} = 11 + 1 \frac{10}{19} = 12 \frac{10}{19} \)

Ответ: a) \( 4 \frac{13}{17} \); б) \( 7 \frac{13}{21} \); в) \( 25 \frac{11}{12} \); г) \( 16 \frac{5}{6} \); д) 8; е) \( 12 \frac{10}{19} \).