Question

помогите я на уроке(((

Answer 1

$2)frac{2frac19:1frac16+3,5}{4frac27:2frac17-0,9}=frac{frac{19}9:frac76+3,5}{frac{30}7:frac{15}7-0,9}=frac{frac{19}9cdotfrac67+3,5}{frac{30}7cdotfrac7{15}-0,9}=frac{frac{19}3cdotfrac27+3frac12}{2-0,9}=frac{frac{38}{21}+frac72}{1,1}=\=frac{frac{76}{42}+frac{147}{42}}{1frac1{10}}=frac{frac{223}{42}}{frac{11}{10}}=frac{223cdot10}{42cdot11}=frac{223cdot5}{21cdot11}=frac{1115}{231}=4frac{191}{231}$

$3);frac{3,9:1,3-1,32}{0,51:1,7+3,06}=frac{3-1,32}{0,3+3,06}=frac{1,68}{3,36}=frac12=0,5\\2);frac{4,5:0,15cdot0,5}{8,5cdotfrac3{17}:0,3}=frac{30cdot0,5}{8frac12cdotfrac3{17}:frac3{10}}=frac{15}{frac{17}2cdotfrac3{17}cdotfrac{10}3}=frac{15}5=3\\3);frac{0,99cdot0,2cdot10,4}{0,22cdot0,9cdot1,3}=frac{9cdot0,2cdot8}{2cdot0,9cdot1}=frac{9cdot0,2cdot4}{0,9}=10cdot0,2cdot4=2cdot4=8$