Question

Помогите пожалуйста!

Answer 1

1.
$frac{8}{12} = frac{2}{3} \ \ frac{22}{77} = frac{2}{7}$
2.
$frac{9}{17} < frac{19}{34} = frac{18}{34} < frac{19}{34} \ \ frac{7}{9} > frac{3}{4} = frac{28}{36} > frac{27}{36}$



3.
$frac{1}{5} + frac{2}{7} = frac{7 + 10}{35} = frac{17}{35} \ \ frac{11}{18} - frac{5}{12 } = frac{22 - 15}{36} = frac{7}{36} \ \ 4 frac{7}{12} + 1 frac{3}{16} = frac{55}{12} + frac{19}{16} = frac{220 + 57}{48} = frac{277}{48} = 5 frac{33}{48} = 5 frac{11}{16} \ \ 8 frac{17}{20} - 6 frac{7}{10} = frac{177}{20} - frac{67}{10} = frac{177 - 134}{20} = frac{43}{20} = 2 frac{3}{20}$
4.
$1). : : 5frac{8}{10} - 2 frac{1}{2} = frac{58}{10} - frac{5}{2} = frac{58 - 25}{2} = frac{23}{2} = 11.5 \ \ 2) . : 11.5 + 5.8 = 17.3 : kg$
ответ: 17,3

5.
$5 frac{8}{21} - x = 2 frac{9}{14} \ \ x = 5 frac{8}{21} - 2 frac{9}{14} \ \ x = frac{113}{21} - frac{37}{14} \ \ x = frac{226 -111 }{42} \ \ x = frac{115}{42} = 2 frac{31}{42}$

Answer 2

Спасибо!