Question

21 целая4/15 + 1 целая5/6 - 9 целых 7/30 + 16целых7/24=?

Answer 1

$21 frac{4}{15}+1 frac{5}{6}-9 frac{7}{30}+16 frac{7}{24}=21 frac{4}{15}-9 frac{7}{30}+1 frac{5}{6}+16 frac{7}{24}=$

$=21 frac{8}{30}-9 frac{7}{30}+1 frac{20}{24}+16 frac{7}{24}=12 frac{1}{30}+17 frac{27}{24}=12 frac{1}{30}+18 frac{3}{24}=$

$=12 frac{1}{30}+18 frac{1}{8}==12 frac{4}{120}+18 frac{15}{120}=30 frac{19}{120}$

Answer 2

$21 frac{4}{15} +1 frac{5}{6} -9 frac{7}{30} +16 frac{7}{24} =30 frac{19}{120}$

$1)21 frac{4}{15} +1 frac{5}{6} =21 frac{8}{30} +1 frac{25}{30} =22 frac{33}{30} =23 frac{3}{30}=23 frac{1}{10} =23,1$

$2)23 frac{1}{10} -9 frac{7}{30} = 23frac{3}{30} -9 frac{7}{30} =22 frac{33}{30} -9 frac{7}{30} = 13frac{26}{30} =13 frac{13}{15}$

$3) 13frac{13}{15} +16 frac{7}{24} =13 frac{104}{120} +16 frac{35}{120} =29 frac{139}{120} =30 frac{19}{120}$