Question

помогите 40 баллов алгебра 7 класс

Answer 1

Ответ:

n+(n+5)+(n+8)=n+n+5+n+8=3n+13

(n-5)+(n-3)+(n+4)=n-5+n-3+n+4=3n-4

(n-2)+(n-9)+2n+(n+8)=n-2+n-9+2n+n+8=

=5n-3

(p-8)-(p+8)=p-8-p-8=-16

(p+12)-(p-12)=p+12-p+12=24

p-(p-7)+(p+7)=p-p+7+p+7=p+14