a: =-12-1=-13
b: =359(-57-43)
=-359*100=-35900
c: \(=\dfrac{10}{8}+\dfrac{4}{8}-\dfrac{7}{8}=\dfrac{7}{8}\)
d: \(=\dfrac{-2}{17}-\dfrac{15}{17}+\dfrac{15}{23}+\dfrac{8}{23}+\dfrac{2021}{2022}\)
=-1+1+2021/2022
=2021/2022
e: =-3-8+3=-8
f: =199(-17+16)=-199
g: =10/8+4/8-7/8=7/8
h: =-1/4+3/7+4/7-11/18-7/18
=-1/4+1-1
=-1/4