Question

(-1)+(+6)+(-2)
(+2) +(-4)+(+5)
(+3)-(-5)
(-4)-(-9)
(+12)+(18)
(-9)+(+27)

Answer 1

$Analizamos \ los \ signos\to -(+= -\qquad +(+=+ \qquad -(-=+\\ \\ (-1)+(+6)+(-2) = -1 +6-2= \boxed{3} \\ \\ (+2) +(-4)+(+5) =2-4+5= \boxed{3} \\ \\ (+3)-(-5)= 3+5= \boxed{8} \\ \\ (-4)-(-9) =-4+9= \boxed{5} \\ \\ (+12)+(18)=12+18= \boxed{30} \\ \\ (-9)+(+27)=-9+27= \boxed{18}$

Espero que te sirva, salu2!!!!