1) (3 1/3+2,5)*(4,6-2 1/3)

[latex](3 frac{1}{3} +2,5)*(4,6-2 frac{1}{3} )=(3 frac{1}{3} +2 frac{1}{2} )*(4 frac{3}{5} -2 frac{1}{3} )=[/latex] [latex](3 frac{2}{6} +2 frac{3}{6} )*(4 frac{9}{15} -2 frac{6}{15} )= 5 frac{5}{6} *2 frac{3}{15} =frac{35}{6} * frac{11}{5} = frac{77}{6} =12 frac{5}{6} [/latex]