Найдите значение выраженияа) 8/19 + 10/19 - 11/19 б) 10 4/21 - ( 4 10/21 + 3 19/21)

а) [latex] \frac{8}{19}+ \frac{10}{19}- \frac{11}{19} 1) [latex] \frac{8}{19}+ \frac{10}{19}= \frac{18}{19} [/latex] 2) [latex] \frac{18}{19}- \frac{11}{19} = \frac{7}{19} [/latex] Ответ: [latex] \frac{7}{19} [/latex] б) 10 4/21 - ( 4 10/21 + 3 19/21) 1) [latex]4 \frac{10}{21}+3 \frac{19}{21} =7 \frac{29}{21}=8 \frac{8}{21} [/latex] 2) [latex]10 \frac{4}{21}- 8 \frac{8}{21} =9 \frac{14}{24}-8 \frac{8}{21} =1 \frac{6}{21}= 1 \frac{2}{7} [/latex] Ответ: [latex]1 \frac{2}{7} [/latex]