c: =7/3(-3/4+2/5)+7/3(3/5-1/4)
=7/3(-3/4+2/5+3/5-1/4)
=0
e: =1/6+5/6*2/3-1/2
=-1/3+10/18
=-6/18+10/18=4/18=2/9
f: =-1:(-5)+1/15-1/15
=1/5
d: \(=\dfrac{7}{8}:\dfrac{4-1}{18}+\dfrac{7}{8}\cdot\dfrac{1-15}{36}\)
\(=\dfrac{7}{8}\left(\dfrac{18}{3}+\dfrac{-14}{36}\right)=\dfrac{707}{144}\)
b: \(=\dfrac{-5}{4}\left(35+\dfrac{1}{6}-46-\dfrac{1}{6}\right)=-11\cdot\dfrac{-5}{4}=\dfrac{55}{4}\)