Question

Решите пример срочно

Answer 1

$displaystyle x= frac{left(3.9-2.55+4frac{5}{12}-1frac{1}{15}right):4.7}{left(0.81cdot8frac{1}{3}-0.57:4 frac{3}{4}right):2.21+4.125:2frac{1}{16}} \ \ 1. 3.9-2.55=1.35=1 frac{35}{100}=1 frac{7}{20}=frac{27}{20} \ \ 2. 4frac{5}{12}-1frac{1}{15}=frac{53}{3cdot4}-frac{16}{3cdot5}=frac{53cdot5-16cdot4}{3cdot4cdot5}=frac{201}{60}=frac{67}{20} \ \ 3. frac{27}{20}+frac{67}{20}=frac{94}{20}=frac{47}{10} \ \ 4. frac{47}{10}:4.7=4.7:4.7=1$
$displaystyle 5. 0.81cdot8frac{1}{3}=frac{81}{100}cdotfrac{25}{3}=frac{81cdot25}{100cdot3}=frac{27}{4} \ \ 6. 0.57:4frac{3}{4}=frac{57}{100}:frac{19}{4}=frac{57cdot4}{100cdot19}=frac{3}{25} \ \ 7. frac{27}{4}-frac{3}{25}=frac{27cdot25-3cdot4}{4cdot25}=frac{663}{100} \ \ 8. frac{663}{100}:2.21=frac{663}{100}:2frac{21}{100}=frac{663}{100}:frac{221}{100}=frac{663cdot100}{100cdot221}=3$
$displaystyle 9. 4.125:2frac{1}{16}=4frac{125}{1000}:frac{33}{16}=frac{4125}{1000}:frac{33}{16}=frac{4125cdot16}{1000cdot33}=2 \ \ 10. 3+2=5 \ \ 11. 1:5=frac{1}{5}$

Ответ: 1/5 = 0.2