4 2/3*6-1 23/42*3 1/13+2 1/8*1 29/51=

4 2/3*6-1 23/42*3 1/13+2 1/8*1 29/51=26 4/7

$1) 4\frac{2}{3}*6= \frac{14}{3}*6=28 \\ \\ 2) 1\frac{23}{42}*3 \frac{1}{13}= \frac{65}{42}* \frac{40}{13}= \frac{13*5}{21*2}* \frac{20*2}{13}= \frac{100}{21} \\ \\ 3) 2 \frac{1}{8}*1 \frac{29}{51}= \frac{17}{8}* \frac{80}{51}= \frac{17}{8}* \frac{8*10}{17*3}= \frac{10}{3} \\ \\ 4)28- \frac{100}{21}+ \frac{10}{3} = \frac{28*21-100+10*7}{21}= \frac{558}{21}=26 \frac{12}{21} =26 \frac{4}{7}$