Выполните сложение: а)3 4/5+1 4/5 б)1 4/9+7 7/18 в)8 4/5+2 1/3 г)12 5/6+4/15 д)7/20+2...

А) 3 $\frac{4}{5}$ +1 $\frac{4}{5}$ = $\frac{19}{5}$ + $\frac{9}{5}$ =   $\frac{28}{5}$ = 5 $\frac{3}{5}$

б) 1 $\frac{4}{9}$ +7 $\frac{7}{18}$   =   $\frac{13}{9}$ +   $\frac{133}{18}$ =   $\frac{26}{18}$ +   $\frac{133}{18}$ =   $\frac{159}{18}$ = 8 $\frac{15}{18}$ = 8 $\frac{5}{6}$

в) 8 $\frac{4}{5}$ +2 $\frac{1}{3}$   = $\frac{44}{5}$ + $\frac{7}{3}$ =   $\frac{132}{15}$ + $\frac{35}{15}$ = $\frac{167}{15}$ = 11 $\frac{2}{15}$

г) 12 $\frac{5}{6}$ + $\frac{4}{15}$   = $\frac{77}{6}$ + $\frac{4}{15}$ =   $\frac{385}{30}$ + $\frac{8}{30}$ =   $\frac{393}{30}$ = 13 $\frac{3}{30}$ = 13,1

д)   $\frac{7}{20}$ +2   $\frac{7}{10}$ =   $\frac{7}{20}$ + $\frac{27}{10}$ =   $\frac{7}{20}$ + $\frac{54}{20}$ =   $\frac{61}{20}$ = 3 $\frac{1}{20}$

е) 8   $\frac{3}{7}$   + 1   $\frac{9}{14}$   =   $\frac{8*7+3}{7}$ +    $\frac{23}{14}$ =   $\frac{59}{7}$ +    $\frac{23}{14}$ = $\frac{59 *2}{7*2}$ +    $\frac{23}{14}$ =    $\frac{118+23}{14}$ = $\frac{141}{14}$ = 10 $\frac{1}{14}$