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

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