Question

1} Media aritmetica a trei numere eeste 19,36 . Afla unul dintre ele stiind ca celealte sunt 13,014 si 18.
2} Media aritmetica a putra numere este 32,024 . care e suma numereloR?
3} Fasiti un numar stiind ca marindu l de 4,2 ori se obtine 17,02.

Answer 1

1)

( a + b + c ) : 3 = 19, 36

a = 13, 014

b = 18

( 13, 014 + 18 + c ) : 3 = 19, 36

( 31, 014 + c ) : 3 = 19, 36

31, 014 + c = 19, 36 × 3

31, 014 + c = 58, 08

c = 58, 08 - 31, 014

c = 27, 066

2.

( a + b + c + d ) : 4 = 32, 024

a + b + c + d = 32, 024 × 4

a + b + c + d = 128, 096

3.

n × 4, 2 = 17, 02

n = 17, 02 : 4, 2

n = 4, 0523