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№5.

а) $2 \frac{1}{4}-1 \frac{1}{2} = 2 \frac{1}{4}-1 \frac{2}{4} = 1 \frac{5}{4} -1 \frac{2}{4} = \frac{3}{4}=0,75$

б) $3 \frac{4}{7} +1 \frac{2}{3}= 3 \frac{12}{21} +1 \frac{14}{21} = 4\frac{26}{21}=5 \frac{5}{21}$

в) $2,5 + 1 \frac{3}{40}=2 \frac{5}{10} +1 \frac{3}{40} = 2 \frac{20}{40}+1\frac{3}{40}= 3\frac{23}{40}$

г) $\frac{9}{32}* \frac{4}{27}= \frac{9*4}{32*27}= \frac{1}{24}$

д) $8,5* \frac{5}{17} =8 \frac{1}{2}* \frac{5}{17} = \frac{17*5}{2*17} =2,5$

е) $5 \frac{2}{3} *9= \frac{17*9}{3}=51$

ё) $\frac{7}{16}: \frac{21}{32}= \frac{7*32}{16*21} = \frac{2}{3}$

ж) $2,7: \frac{9}{14}= 2\frac{7}{10} : \frac{9}{14} = \frac{27*14}{10*9}= 4\frac{1}{5}= 4,2$

з) $2 \frac{3}{7} : 51= \frac{17}{7*51}= \frac{1}{21}$

и) $2 \frac{2}{3} : 5 \frac{1}{5} = \frac{8*5}{3*26} = \frac{20}{39}$