A = [tex]\frac{8}{5} + \frac{7*4}{5*5} = \frac{8}{5} + \frac{28}{25} = \frac{8*5}{5*5} + \frac{28}{25}= \frac{40}{25} + \frac{28}{25} = \frac{40+28}{25} = \frac{68}{25}[/tex]
B = [tex]\frac{1}{2} - \frac{3*16}{4*9} = \frac{1}{2} - \frac{3*4*4}{4*3*3} = \frac{1}{2} - \frac{4}{3} = \frac{1*3}{2*3} - \frac{4*2}{3*2} = \frac{3}{6} - \frac{8}{6} = \frac{3-8}{6} = \frac{-5}{6}[/tex]
C = [tex](\frac{1*2}{5*2} - \frac{3}{10}) * (\frac{1}{6} + \frac{1*3}{2*3}) = (\frac{2}{10} - \frac{3}{10}) * (\frac{1}{6} + \frac{3}{6}) = \frac{2-3}{10} * \frac{1+3}{6} = \frac{-1}{10} * \frac{4}{6} = \frac{-1*4}{10*6}[/tex] [tex]= \frac{-1*2*2}{(2*5)*(2*3)} = \frac{-1}{15}[/tex]
