Question

помогите решить пример номер 638 (б)

Answer 1

$1);2frac2{15}+2frac7{10}=2frac4{30}+2frac{21}{30}=4frac{25}{30}=4frac56=frac{29}6\2);2frac7{10}-2frac2{15}=2frac{21}{30}-2frac4{30}=frac{17}{30}\3);frac{29}6:1frac2{27}=frac{29}6:frac{29}{27}=frac{29}6cdotfrac{27}{29}=frac12cdotfrac9{1}=frac92=4frac12\4);frac{17}{30}:2frac37=frac{17}{30}:frac{17}7=frac{17}{30}cdotfrac7{17}=frac7{30}\5);4frac12-frac7{30}=4frac{15}{30}-frac7{30}=4frac8{30}=4frac4{15}$