a,-14+(-18)-(-9)-5
=-14-18+9-5
=-32+9-5
=-23-5
=-28
b,-12+(-14)-17+(-13)
=-12-14-17-13
=(-12-14)+(-17-13)
=-26+(-20)
=-46
c,11-15+13-17+8-1
=(11-15)+(13-17)+(8-1)
=-4+(-4)+7
=-8+7
=-1
a, -14 + ( -18 ) - ( -9 ) - 5
= -14 - 18 + 9 - 5
= -32 + 9 - 5
= -23 - 5
= -28