a) 6*[tex] 3^{-1} [/tex]=6*[tex] \frac{1}{3} [/tex]=[tex] \frac{6}{3} [/tex]=2
b)[tex] \frac{2}{3}* 2^{-1}= \frac{2}{3}* \frac{1}{2}= \frac{2}{6}= \frac{1}{3} [/tex]
c)[tex]( \frac{3}{2}) ^{-2}* \frac{3}{4}= \frac{-9}{-4}* \frac{3}{4}= \frac{9}{4}* \frac{3}{4}= \frac{27}{16} [/tex]
d)[tex]( -\frac{2}{5} )^{-2} / \frac{5}{2} =- \frac{4}{10}/ \frac{5}{2}= \frac{10}{4} [/tex]
