Question

Срочно помогите пожалуйста
15 баллов

Answer 1

21)
$6 frac{5}{18} + 7 frac{6}{27} = 6 frac{5}{18} + 7 frac{2}{9} = frac{113}{18} + frac{65}{9} = frac{113}{18} + frac{130}{18} = frac{243}{18} = frac{27}{2} = 13 frac{1}{2}$
22)
$1 frac{3}{20} + 3 frac{5}{12} = frac{23}{20} + frac{ 41 }{12} = frac{69}{60} + frac{205}{60} = frac{274}{60} = frac{137}{30} = 4 frac{17}{30}$
23)
$1 frac{7}{20} + 4 frac{7}{12} = frac{27}{20} + frac{55}{12} = frac{81}{60} + frac{275}{60} = frac{356}{60} = frac{89}{15} = 5 frac{14}{15}$
24)
$2 frac{13}{30} + 1 frac{3}{20} = frac{73}{30} + frac{23}{20} = frac{146}{60} + frac{69}{60} = frac{215}{60} = frac{43}{12} = 3 frac{7}{12}$
25)
$7 frac{5}{8} + 5 frac{1}{12} = frac{61}{8} + frac{61}{12} = frac{183}{24} + frac{122}{24} = frac{305}{24} = 12 frac{17}{24}$
26)
$3 frac{8}{45} + 7 frac{13}{18} = frac{143}{45} + frac{139}{18} = frac{286}{90} + frac{695}{90} = frac{981}{90} = frac{109}{10} = 10 frac{9}{10}$
27)
$2 frac{1}{14} + 8 frac{12}{35} = frac{29}{14} + frac{292}{35} = frac{145}{70} + frac{584}{70} = frac{729}{70} = 10 frac{29}{70}$
28)
$5 frac{8}{35} + 7 frac{5}{14} = frac{183}{35} + frac{103}{14} = frac{366}{70} + frac{515}{70} = frac{881}{70} = 12 frac{41}{70}$
29)
$10 frac{2}{5} + 15 frac{5}{6} = frac{52}{5} + frac{95}{6} = frac{312}{30} + frac{475}{30} = frac{787}{ 30} = 26 frac{7}{30}$
30)
$9 frac{7}{8} + 5 frac{2}{7} = frac{79}{8} + frac{37}{7} = frac{553}{56} + frac{296}{56} = frac{849}{56} = 15 frac{9}{56}$