Question

Выполните вычитание:
а) 4 14/19 - 2 5/19
б) 8 7/10 - 5
в) 12 - 7/8
г) 11 - 3 5/12
д) 8 3/15 - 3 11/15
е) 10 9/14 - 3 9/14

Answer 1

$ttdisplaystyle 1) 4frac{14}{19}-2frac{5}{19}=(4-2)+(frac{14}{19}-frac{5}{19})=2+frac{14-5}{19}=\\\=2+frac{9}{19}=2frac{9}{19}\\\\2) 8frac{7}{10}-5=(8-5)+frac{7}{10}=3+frac{7}{10}=3frac{7}{10}=3,7\\\\3) 12-frac{7}{8}=11frac{8}{8}-frac{7}{8}=11+(frac{8}{8}-frac{7}{8})=11+frac{8-7}{8}=\\\=11+frac{1}{8}=11frac{1}{8}=11,125$

$ttdisplaystyle 4) 11-3frac{5}{12}=10frac{12}{12}-3frac{5}{12}=(10-3)+(frac{12}{12}-frac{5}{12})=7+frac{12-5}{12}=\\\=7+frac{7}{12}=7frac{7}{12}\\\\5) 8frac{3}{15}-3frac{11}{15}=7frac{18}{15}-3frac{11}{15}=(7-3)+(frac{18}{15}-frac{11}{15})=\\\=4+frac{18-11}{15}=4+frac{7}{15}=4frac{7}{15}\\\\6) 10frac{9}{14}-3frac{9}{14}=(10-3)+(frac{9}{14}-frac{9}{14})=7+0=7$