Question

Срочно, даю 40 баллов

Answer 1

Ответ:

$1)\ \ 4\dfrac{5}{17}+\dfrac{8}{17}=4\dfrac{13}{17}\ \ ,\\\\\\3\dfrac{5}{21}+4\dfrac{8}{21}=7\dfrac{13}{21}\ \ ,\\\\\\13+12\dfrac{11}{12}=25\dfrac{11}{12}\ ,\\\\\\9\dfrac{5}{6}+7=16\dfrac{5}{6}\ \ ,\\\\\\3\dfrac{12}{13}+4\dfrac{11}{13}=7\dfrac{23}{13}=8\dfrac{10}{13}\ \ ,\\\\\\7\dfrac{15}{19}+4\dfrac{14}{19}=11\dfrac{29}{19}=12\dfrac{10}{19}\ .$

$2)\ \ 9\dfrac{11}{12}-3\dfrac{10}{12}=6\dfrac{1}{12}\ \ ,\\\\\\9\dfrac{11}{15}-4=5\dfrac{11}{15}\ \ ,\\\\\\11-\dfrac{5}{18}=10\dfrac{18}{18}-\dfrac{5}{18}=10\dfrac{13}{18}\ \ \ ,\\\\\\21-8\dfrac{7}{15}=20\dfrac{15}{15}-8\dfrac{7}{15}=12\dfrac{8}{15}\\\\\\8\dfrac{3}{17}-4\dfrac{11}{17}=7\dfrac{20}{17}-4\dfrac{11}{17}=3\dfrac{9}{17}\\\\\\10\dfrac{15}{16}-3\dfrac{15}{16}=7$