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)
$9 \frac{7}{8} + 5 \frac{2}{7} = \frac{79}{8} + \frac{37}{7} = \frac{553}{56} + \frac{296}{56} = \frac{849}{56} = 15 \frac{9}{56}$