Question

3/8 * 5 + 4 1/6 * 2 1/10 - 9/20 * 6
решите пожалуйста по действиям :3

Answer 1

$frac38cdot5+4frac16cdot2frac1{10}-frac9{20}cdot6=\ =frac{3cdot5}{8}+frac{4cdot6+1}{6}cdotfrac{2cdot10+1}{10}-frac{9cdot6}{20}=\ =frac{15}{8}+frac{24+1}{6}cdotfrac{20+1}{10}-frac{54}{20}=\ =frac{15}{8}+frac{25}{6}cdotfrac{21}{10}-frac{54}{20}=\ =frac{15}{8}+frac{5cdot5}{2cdot3}cdotfrac{3cdot7}{2cdot5}-frac{27cdot2}{10cdot2}=\ =frac{15}{8}+frac{3cdot5cdot5cdot7}{2cdot2cdot3cdot5}-frac{27}{10}=$
$=frac{15}{8}+frac{5cdot7}{2cdot2}-frac{27}{10}=frac{15}{8}+frac{35}{4}-frac{27}{10}=\ =frac{15cdot5+35cdot10-27cdot4}{40}=frac{75+350-108}{40}=frac{317}{40}=7frac{37}{40}$

Answer 2

Спасибо:3