Question

Даю 30 баллов помогите решить. 3 5/21 + 4 8/21,
9 5/6 + 7, 3 12/23 + 4 11/23,
7 15/19 + 4 14/19;

9 11/12 - 3 10/12, 11 - 5/18, 8 3/17 - 4 11/17, 9 11/15 - 4, 21 - 8 7/15,
10 15/16 - 3 15/16.​

Answer 1

Ответ:

$3\frac{5}{21} +4\frac{8}{21} =7\frac{13}{21}\\\\9\frac{5}{6} +7=16\frac{5}{6} \\\\3\frac{12}{23}+4\frac{11}{23} =7\frac{23}{23} =8\\\\7\frac{15}{19} +4\frac{14}{19} =11\frac{29}{19} =12\frac{10}{19} \\\\\\9\frac{11}{12} -3\frac{10}{12} =6\frac{1}{12} \\\\11-\frac{5}{18} =10\frac{18}{18} -\frac{5}{18} =10\frac{13}{18} \\\\8\frac{3}{17}-4\frac{11}{17} =7\frac{17+3}{17}-4\frac{11}{17} =7\frac{20}{17} -4\frac{11}{17} =3\frac{9}{17} \\\\9 \frac{11}{15} -4=5\frac{11}{15}$

$21-8\frac{7}{15} =13\frac{7}{15} \\\\10\frac{15}{16} -3\frac{15}{16} =7$

Удачи!