2\frac{3}{4}+11\frac{4}{5}-8,5=\frac{11}{4}+\frac{59}{5}-8,5=2,75+11,8-8,5=6,05
1\frac{1}{3}-\frac{1}{3}*\frac{6}{7}*\frac{14}{15}*\frac{5}{4}=1\frac{1}{3}-\frac{1}{1}*\frac{2}{7}*\frac{7}{3}*\frac{1}{2}=1\frac{1}{3}-\frac{14}{42}=1\frac{1}{3}-\frac{1}{3}=1
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