[tex]3\cdot2\frac{2}{3} = 3\cdot\frac{8}{3} = 8\\\\1\frac{3}{4}\cdot 4 =\frac{7}{4}\cdot4 = 7\\\\x + 2\frac{5}{6}+4+2\frac{4}{6}} = x+4\frac{9}{6}+4=x+5\frac{3}{6} +4 = x + 9\frac{1}{2}=x+9,5\\\\(8\frac{3}{8}\cdot2) + (6\frac{2}{8}\cdot2) = (\frac{67}{8}\cdot2) + (\frac{50}{8}\cdot2) = \frac{67}{4}+\frac{50}{4} = \frac{117}{4} = 29\frac{1}{4} = 29,25[/tex]
