(2) Resolva as expressōes numéricas , aplicando as regras de s a) -9+7= __ b) +4+6=underline ( ) c) +12+(-12)=underline ( ) d) -7-(+10)=underline ( ) e) bigcirc +(-8)=underline ( ) f) -(-15)-(-16)=underline ( ) g) -11-9=underline ( ) h) -(-18)+(-22)=underline ( ) i) 12-(-4)+(-7)= __ j) -7+(+10)-(+5)=underline ( ) k) -22+(+15)+(-8)-(-16)-(+13)=underline ( ) 1) -(10+8)+(-15+33)-(-1+8)-(-17+10)=underline ( )

a) $$-9+7=-2$$
b) $$+4+6=10$$
c) $$+12+(-12)=0$$
d) $$-7-(+10)=-17$$
e) $$\bigcirc +(-8)=\bigcirc -8$$ (Note: The symbol $$\bigcirc$$ is not defined in the question, so the answer cannot be determined.)
f) $$-(-15)-(-16)=15+16=31$$
g) $$-11-9=-20$$
h) $$-(-18)+(-22)=18-22=-4$$
i) $$12-(-4)+(-7)=12+4-7=9$$
j) $$-7+(+10)-(+5)=-7+10-5=-2$$
k) $$-22+(+15)+(-8)-(-16)-(+13)=-22+15-8+16-13=-8$$
l) $$-(10+8)+(-15+33)-(-1+8)-(-17+10)=-(18)+(-15+33)-(-7)-(-7)=-18+18+7+7=14$$