a, ( $\frac{2}{3}$ )$^{3}$ -($\frac{3}{4}$ )$^{2}$ . (-1)$^{5}$
= $\frac{8}{27}$ - $\frac{9}{16}$ .(-1)
=$\frac{8}{27}$ +$\frac{9}{16}$
=$\frac{371}{432}$
b,12:($\frac{3}{4}$ -$\frac{5}{6}$) $^{2}$
=12:($\frac{9}{12}$ -$\frac{10}{12}$ )$^{2}$
=12:($\frac{-1}{12}$ )$^{2}$
=12:$\frac{1}{144}$
=12.144
=1728
c,$\frac{7}{22}$ :$\frac{3}{11}$ +$\frac{7}{22}$ :$\frac{4}{11}$
=$\frac{7}{22}$ :($\frac{3}{11}$ +$\frac{4}{11}$ )
=$\frac{7}{22}$ :$\frac{7}{11}$
=$\frac{7}{22}$ .$\frac{11}{7}$
=$\frac{1}{2}$
d,$\frac{12}{35}$ .($\frac{7}{4}$ +$\frac{13}{4}$)- $\frac{1}{3}$
=$\frac{12}{35}$ .5 -$\frac{1}{3}$
=$\frac{12}{7}$ -$\frac{1}{3}$
=$\frac{36}{21}$ -$\frac{7}{21}$
=$\frac{29}{21}$
