Question

выполните действие: 1) 7/12+ 7/20 2) 3/8+ 1/18 3) 1/12 +11/14 4) 2/15 -7/12 5) 9/14 - 5/12 6) 19/75 + 7/50

Answer 1

Решение:

$ttdisplaystyle 1);frac{7}{12}+frac{7}{20}=frac{7*5}{60}+frac{7*3}{60}=frac{35+21}{60}=frac{56}{60}=frac{14}{15}\\\2);frac{3}{8}+frac{1}{18}=frac{3*9}{72}+frac{1*4}{72}=frac{27+4}{72}=frac{31}{72}\\\3);frac{1}{12}+frac{11}{14}=frac{1*7}{84}+frac{11*6}{84}=frac{7+66}{84}=frac{73}{84}\\\4);frac{2}{15}-frac{7}{12}=frac{2*4}{60}-frac{7*5}{60}=frac{8-35}{60}=frac{-27}{60}=-frac{9}{20}$

$ttdisplaystyle \\5);frac{9}{14}-frac{5}{12}=frac{9*6}{84}-frac{5*7}{84}=frac{54-35}{84}=frac{19}{84}\\\6);frac{19}{75}+frac{7}{50}=frac{19*2}{150}+frac{7*3}{150}=frac{38+21}{150}=frac{59}{150}$