1.) Oblicz [latex] frac{2}{5} [/latex] sumy liczb [latex] 3frac{1}{2} [/latex] i [latex] 2frac{1}{3} [/latex] 2.) Oblicz [latex] frac{3}{4} [/latex] sumy liczb [latex] 4frac{1}{5} [/latex] i [latex] 3frac{2}{3} [/latex]

1) [latex]frac{2}{5} cdot (3frac{1}{2} + 2frac{1}{3}) = frac{2}{5}cdot (3 frac{3}{6} + 2 frac{2}{6}) = frac{2}{5} cdot 5frac{5}{6} = frac{2}{5} cdot frac{35}{6} = frac{7}{3}[/latex] 2) [latex]frac{3}{4} cdot (4frac{1}{5} - 3frac{2}{3}) = frac{3}{4} cdot (frac{21}{5} - frac{11}{3}) = frac{3}{4} cdot (frac{63}{15} - frac{55}{15}) = frac{3}{4} cdot frac{8}{15} = frac{2}{5}[/latex]