Даю 10 баллов помогите279 281

НОМЕР 279 .
$1 - \frac{13}{55} = \frac{1*55-13}{55} = \frac{55-13}{55} = \frac{42}{55}$
$6- \frac{9}{20} = \frac{6*20-9}{20} = \frac{120-9}{20} = \frac{111}{20} = 5 \frac{11}{20}$
$5 \frac{12}{35} = \frac{187}{35}$
$10 - \frac{187}{35} = \frac{10*35-187}{35} = \frac{350-187}{35} = \frac{163}{35} = 4 \frac{23}{35}$
$4 \frac{5}{22} = \frac{93}{22}$
$8- \frac{93}{22} = \frac{8*22-93}{22} = \frac{176-93}{22} = \frac{83}{22}= 3 \frac{17}{22}$
НОМЕР 281.
$4 \frac{3}{16} = \frac{67}{16} - \frac{5}{8} = \frac{67}{16} - \frac{5*2}{8*2} = \frac{67}{16} - \frac{10}{16} = \frac{67-10}{16} = \frac{57}{16}=3 \frac{9}{16}$
$6 \frac{4}{9} - 3 \frac{6}{7} = \frac{58}{9} - \frac{27}{7} = \frac{58*7-9*27}{9*7} = \frac{406-243}{63} = \frac{163}{63} = 2 \frac{37}{63}$
$9 \frac{1}{6} - 5 \frac{3}{4} = \frac{55}{6} - \frac{23}{4} = \frac{55*2}{6*2} - \frac{23*3}{4*3} = \frac{110}{12} - \frac{69}{12} = \frac{41}{12} =3 \frac{5}{12}$