a.3784+23-3784-15

=(3784-3784)+(23-15)

=0+8

=8

b.21+22+23+24-11-12-13-14

=(21-11)+(22-12)+(23-13)+(24-14)

=10+10+10+10

=40

a/(-15)^2=(-15).(-15)=225

b/(-1)^10000=1

c/(-2)^5=(-2).(-2).(-2).(-2).(-2)=-32

a/3|x|=18=>|x|=6=>x=6 hay x=-6

-11|x|=-22=>|x|=2=>x=2 hay -2

1

10cm