c ) 12/12 = 1
5.
a) 13/8
c ) 35 / 36
6.
a)3/20
c) 2/20 = 1/10
\(c,\dfrac{17}{12}-\dfrac{5}{12}=\dfrac{17-5}{12}=1\)
\(5a,\dfrac{13}{18}-\dfrac{4}{9}=\dfrac{13}{18}-\dfrac{8}{18}=\dfrac{5}{18}\)
\(c,\dfrac{5}{9}+\dfrac{5}{12}=\dfrac{35}{36}\)
\(6a,\dfrac{1}{5}\times\dfrac{3}{4}=\dfrac{1\times3}{5\times4}=\dfrac{3}{20}\)
\(c,\dfrac{1}{4}\times\dfrac{2}{5}=\dfrac{2}{20}=\dfrac{1}{10}\)