Question

Помогите пожалуйста даю 20 баллов

Answer 1

$1) 6:frac{3}{5}=6cdotfrac{5}{3}=2cdot5=10, \ 2) 1frac{1}{6}cdotfrac{6}{7}=frac{1cdot6+1}{6}cdotfrac{6}{7}=frac{7}{6}cdotfrac{6}{7}=1, \ 3) 10-1=9, \ 4) 4frac{1}{5}cdotfrac{10}{11}=frac{4cdot5+1}{5}cdotfrac{10}{11}=frac{21}{5}cdotfrac{10}{11}=21cdotfrac{2}{11}=frac{42}{11}=3frac{9}{11}, \ 5) 3frac{9}{11}+5frac{2}{11}=8frac{11}{11}=9, \ 6) frac{9}{9}=1;$
$7) frac{3}{20}+frac{1}{2}=frac{3}{20}+frac{10}{20}=frac{13}{20}, \ 8) frac{13}{20}-frac{1}{15}=frac{39}{60}-frac{4}{60}=frac{35}{60}=frac{7}{12}, \ 9) frac{7}{12}cdotfrac{12}{49}=1cdotfrac{1}{7}=frac{1}{7}, \ 10) frac{1}{5}+frac{1}{7}=frac{7}{35}+frac{5}{35}=frac{12}{35}, \ 11) frac{frac{1}{7}}{frac{12}{35}}=frac{1cdot35}{7cdot12}=frac{5}{12}; \ 12) 1-frac{5}{12}=frac{12}{12}-frac{5}{12}=frac{7}{12};$
$13) frac{7}{12}cdot2frac{1}{3}=frac{7}{12}cdotfrac{7}{3}=frac{49}{36}, \ 14) 3frac{1}{4}-frac{49}{36}=frac{13}{4}-frac{49}{36}=frac{117}{36}-frac{49}{36}=frac{68}{36}=frac{17}{9}=1frac{8}{9}.$