Myślę, że pomogłam . ; ))
1. [latex]a)\6 frac{5}{6} -(3 frac{1}{8} +1 frac{1}{2} ) =\ \ frac{41}{6} - ( frac{25}{8} + frac{3}{2} ) =\ \ frac{41}{6} - ( frac{25}{8} + frac{12}{8} )= \ \ frac{41}{6} - frac{37}{8} = frac{164}{24} - frac{111}{24} = frac{53}{24} =2 frac{5}{24} [/latex] [latex]b) \ \6 frac{5}{6} -3 frac{1}{8} +1 frac{1}{2} =\ \ frac{41}{6} - frac{25}{8} + frac{3}{2} =\ \ frac{164}{24} - frac{125}{24} + frac{36}{24} =\ \ frac{39}{24} +frac{36}{24} = frac{77}{24} =3 frac{5}{24} [/latex] 2. [latex]a)\ frac{4}{9} - frac{5}{12} =frac{16}{36} -frac{15}{36}=frac{1}{36} \ \ b) \ frac{7}{15}+frac{9}{10}=frac{28}{60}+frac{54}{60}=frac{82}{60}=1frac{22}{60}=1frac{11}{30} \ \ c) \frac{5}{6}-frac{5}{9}=frac{15}{18}- frac{10}{18} = frac{5}{18} [/latex]