Question

(6 3/5-3 3/14)×5 5/6/(21-1,25)÷2,5

Answer 1

$(6 frac{3}{5}-3 frac{3}{14})*5 frac{5}{6} : (21-1,25):2,5=(frac{33}{5}-frac{45}{14})*frac{35}{6} : (21- frac{5}{4} ): frac{5}{2} = \ \ =(frac{33*14-45*5}{70})*frac{35}{6} : (frac{21*4-5}{4} ): frac{5}{2}=frac{237}{70}*frac{35}{6} : frac{79}{4}: frac{5}{2} = \ \ =frac{79}{4} : frac{79}{4}: frac{5}{2}=1:frac{5}{2}=1*frac{2}{5}=frac{2}{5}$