Выполни действие: 1) 2 7/19 + 6 12/19 =

1) $2 \frac{7}{19} + 6 \frac{12}{19} = 8 \frac{19}{19} = 9$ 2) $3 - \frac{5}{8} = 2 \frac{8}{8} - \frac{5}{8} = 2 \frac{3}{8}$ 3) $\frac{2}{43} + 1 = 1 \frac{2}{43}$ 4) $12 \frac{3}{16} - 2 \frac{7}{20} = 12 \frac{15}{80} - 2 \frac{28}{80} = 11 \frac{95}{80} - 2 \frac{28}{80} = 9 \frac{67}{80}$ 5) $\frac{13}{21} + \frac{10}{21} = \frac{23}{21} = 1 \frac{2}{21}$ 6) $7 \frac{5}{21} - 4 \frac{13}{42} = 7 \frac{10}{42} - 4 \frac{13}{42} = 6 \frac{52}{42} - 4 \frac{13}{42} = 2 \frac{39}{42} = 2 \frac{13}{14}$ 7) $11 \frac{5}{12} + \frac{1}{12} = 11 \frac{6}{12} = 11 \frac{1}{2}$ 8) $\frac{7}{24} + \frac{11}{40} = \frac{35}{120} + \frac{33}{120} = \frac{68}{120} = \frac{17}{30}$ 9) $1 - \frac{12}{25} = \frac{25}{25} - \frac{12}{25} = \frac{13}{25}$ 10) $21 \frac{7}{34} - 6 \frac{8}{51} = 21 \frac{21}{102} - 6 \frac{16}{102} = 15 \frac{5}{102}$ 11) $4 \frac{5}{9} + 2 \frac{11}{27} = 4 \frac{15}{27} + 2 \frac{11}{27} = 6 \frac{26}{27}$ 12) $28 \frac{9}{25} - 15 \frac{5}{8} = 28 \frac{72}{200} - 15 \frac{125}{200} = 27 \frac{272}{200} - 15 \frac{125}{200} = 12 \frac{147}{200}$