Question

Ребята помогите срочно!!!!

Answer 1

а)

$n+(n+3)+(n+6)=n+n+3+n+6=3n+9$

$(n-3)+(n-1)+(n+1)=n-3+n-1+n+1=3n-3$

$(n-10)+(n-5)+n+(n+5)=n-10+n-5+n+n+5=4n-10$

б)

$(p-5)-(p+5)=p-5-p-5=-10$

$(p+5)-(p-5)=p+5-p+5=10$

$p-(p-5)+(p+5)=p-p+5+p+5=p+10$