Номер 50 ( 1,2) 51(1,2) 52 (1,2,5,6) Хто перший у того буде найкращя робота)))) Швидко...

50 (1)
$12\frac{3}{8}+8\frac{1}{6}=20+\frac{3}{8}+\frac{1}{6}=20+\frac{9+4}{24}=20\frac{13}{24}$
50 (2)
$3\frac{13}{15}+6\frac{7}{10}=9+\frac{13}{15}+\frac{7}{10}=9+\frac{26+21}{30}=9+\frac{47}{30}=9+1\frac{17}{30}=10\frac{17}{30}$
51 (1)
$7\frac{5}{6}-3\frac{2}{3}=4+\frac{5}{6}-\frac{2}{3}=4+\frac{5-4}{6}=4\frac{1}{6}$
51 (2)
$8\frac{5}{12}-6\frac{7}{20}=2+\frac{5}{12}-\frac{7}{20}=2+\frac{25-21}{60}=2\frac{4}{60}=2\frac{1}{15}$
52 (1)
$3\frac{1}{16}-\frac{1}{8}=2+\frac{17}{16}-\frac{2}{16}=2+\frac{17-2}{16}=2\frac{15}{16}$
52 (2)
$7\frac{9}{20}-5\frac{17}{30}=2+\frac{27}{60}-\frac{34}{60}=1+\frac{87}{60}-\frac{34}{60}=1+\frac{87-34}{60}=1\frac{53}{60}$
52 (5)
$9\frac{7}{9}-4\frac{5}{6}=5+\frac{14}{18}-\frac{15}{18}=4+\frac{32}{18}-\frac{15}{18}=4+\frac{32-15}{18}=4\frac{17}{18}$
52 (6)
$6\frac{7}{32}-2\frac{11}{48}=4+\frac{21}{96}-\frac{22}{96}=3+\frac{117}{96}-\frac{22}{96}=3+\frac{117-22}{96}=3\frac{95}{96}$