1)[tex] \frac{5}{2}- \frac{9}{4}= \frac{ 10-9}{4} = \frac{1}{4} [/tex]
2)[tex] \frac{1}{4}: \frac{1}{16}= \frac{1}{4} [/tex]x[tex] \frac{16}{1} [/tex][tex] \frac{16}{4}=4 [/tex]
3)[tex] \frac{1}{7}-4= \frac{1}{7}- \frac{28}{7} = \frac{1-28}{7}=- \frac{27}{7}=-3 \frac{6}{7} [/tex]
4)[tex]9 \frac{2}{3}: (-3\frac{6}{7})= \frac{29}{3} [/tex]x[tex]- \frac{7}{27}=- \frac{29x7}{3x27}=- \frac{203}{81} =-2 \frac{41}{81} [/tex]
