Question

Ex 9 va rog punctele a,b,c,d,e mersi, dau coroana!

Answer 1

a)n
   n+1
   n+2
n+n+1+n+2=54
3n=51 =>n=17
Numerele sunt 17, 18 si 19.

b)n
   n+1
   n+2
   n+3
n+n+1+n+2+n+3=90
3n=84 =>n=28
Numerele sunt 28, 29, 30 si 31.

c)2n
   2n+2
   2n+4
2n+2n+2+2n+4=252
6n=246 =>n=41
Numerele sunt 82, 84 si 86.

d)n
   n+1
   n+2
   n+3
   n+4
n+n+1+n+2+n+3+n+4=75
5n=65 =>n=13
Numerele sunt 13, 14, 15, 16 si 17.

e)2n+1
   2n+3
   2n+5
   2n+7
2n+1+2n+3+2n+5+2n+7=72
8n=56 =>n=7
Numerele sunt 15, 17, 19 si 21.

Answer 2

a+b+c=54
B=a+1
C=b+1=a+2
A+a+1+a+2=54
3a+3=54
3a=51
A=51:3
A=17