Question

Media aritmetica a 10 nr. Naturale consecutive este 11,5.Afla nr.

Answer 1

notam nr cu "x"
(x+x+1+x+2+x+3+x+4+x+5+x+6+x+7+x+8+x+9):10=11,5
10x+1+2+3+4+5+6+7+8+9=11,5·10
10x+45=115
10x=115-45
10x=70
x=70:10
x=7
x+1=7+1=8
x+2=7+2=9
x+3=7+3=10
x+4=7+4=11
x+5=7+5=12
x+6=7+6=13
x+7=7+7=14
x+8=7+8=15
x+9=7+9=16

sper ca te am ajutat