a. 2-(4-6)=2+2=4
b.-1-(5-7)=-1+2=1
c.10-(-8-9)=10+17=27
d.6-(8-(-11))=6-(8+11)=6-19=-13
e.-12-(-14-6)=-12-20=-32
f.-11-(4-(-19))=-11-(4+19)=-11-23=-34
g.12-(-27-(-5))=12-(-27+32)=12-5=7
h.-6-(-3-(-15))=-6-(-3+15)=-6+12=6
i.0-(-5-25)=-30
