Question

1)1-9/31
2)2-21/53
3)8-1 39/44
4)7-3 21/23
5)1 4/7 + 2 4/21
6)4 2/3 + 5 4/7
7)9 5/9 + 5 1/4
8)6 10/21 + 4 5/6
9)0,8 -5/9
10) 0,48 + 3/8

Answer 1

Если есть вопросы пишите

Answer 2

1) 1 - $frac{9}{31}$ = $frac{31}{31}$ - $frac{9}{31}$ = $frac{22}{31}$ 
2) 2 - $frac{21}{53}$ = 1 $frac{53}{53}$ - $frac{21}{53}$ = 1 $frac{32}{53}$ 
3) 8 - 1 $frac{39}{44}$ = 7 $frac{44}{44}$ - 1 $frac{39}{44}$ = 6 $frac{5}{44}$ 
4) 7 - 3 $frac{21}{23}$ = 6 $frac{23}{23}$ - 3 $frac{21}{23}$ = 3 $frac{2}{23}$ 
5) 1 $frac{4}{7}$ + 2 $frac{4}{21}$ = 1 $frac{12}{21}$ + 2 $frac{4}{21}$ = 3 $frac{16}{21}$ 
6) 4 $frac{2}{3}$ + 5 $frac{4}{7}$ = 4 $frac{14}{21}$ + 5 $frac{12}{21}$ = 9 $frac{26}{21}$ = 10 $frac{5}{21}$ 
7) 9 $frac{5}{9}$ + 5 $frac{1}{4}$ = 9 $frac{20}{36}$ + 5 $frac{9}{36}$ = 14 $frac{29}{36}$ 
8) 6 $frac{10}{21}$ + 4 $frac{5}{6}$  = 6 $frac{20}{42}$ + 4 $frac{35}{42}$ = 10 $frac{55}{42}$ = 11 $frac{13}{42}$ 
9) 0,8 - $frac{5}{9}$ = $frac{8}{10}$ - $frac{5}{9}$ = $frac{72}{90}$ - $frac{50}{90}$ = $frac{22}{90}$ = $frac{11}{45}$ 
10) 0,48 + $frac{3}{8}$ = $frac{48}{100}$ + $frac{3}{8}$ = $frac{12}{25}$ + $frac{3}{8}$ = $frac{96}{200}$ + $frac{75}{200}$ = $frac{171}{200}$