Question

ajutatima la ex 8,9,10,11

Answer 1

8.
a=0,3+10-6,5-0,72
a=3,08
b=2,7+2,25-4,02
b=0,93
M.a.=(3,08+0,93)/2=2,005

9.
a=3,2+13,6-4
a=12,8
b=12,3·1,5+0,03
b=18,48
c=19-3,5+0,155-0,015
c=15,64
M.a.=(12,8+18,48+15,64)/3=15,64

10.
Este deja rezolvata.

11.
n
n+1
n+2
n+3
n+4
M.a.=(n+n+1+n+2+n+3+n+4)/5=5 =>n+n+1+n+2+n+3+n+4=25
5n=25-10
5n=15 =>n=3
=>Numerele sunt 3, 4, 5, 6, 7.