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$\frac{5,3:2,4-1 \frac{1}{12}}{0,702:1,3-0,415}=0,9$
1) 5,3:2,4= $\frac{53}{10}: \frac{24}{10}=\frac{53}{10}*\frac{10}{24} = \frac{53}{24}=2 \frac{5}{24}$
2) $2 \frac{5}{24}-1 \frac{1}{12}=2 \frac{5}{24}-1 \frac{2}{24}= 1\frac{3}{24}=1\frac{1}{8}$
3) 0,702:1,3=0,54
4) 0,54-0,415=0,125
5) $1 \frac{1}{8}:0,125= \frac{9}{8}: \frac{125}{100}=\frac{9}{8}:\frac{5}{4}=\frac{9}{8}* \frac{4}{5}= \frac{9}{2*5}=\frac{9}{10}=0,9$