10 Вычислите: rac{12}{37} : (rac{5}{16} + rac{3}{20})

1. НОК(16, 20) = 80. 2. rac{5}{16} + rac{3}{20} = rac{5 · 5}{80} + rac{3 · 4}{80} = rac{25+12}{80} = rac{37}{80}. 3. rac{12}{37} : rac{37}{80} = rac{12}{37} · rac{80}{37} = rac{960}{1369}