Question

multumesc !!!Calculați media aritmetică a următoarelor numere raționale pozitive:
b) 1/2 , 2/3 , 3/4 ; c) 2/3 , 5/6 , 1/9 ; d) 5/3 , 3/4 , 9/8 ​

Answer 1

Răspuns:

Explicație pas cu pas:

$b)~(\frac{1}{2}+\frac{2}{3}+\frac{3}{4}):3=(\frac{6}{12}+\frac{8}{12}+\frac{9}{12}):3=\frac{23}{12} *\frac{1}{3}=\frac{23}{36} \\c)~(\frac{2}{3}+\frac{5}{6}+\frac{1}{9}):3=(\frac{12}{18}+\frac{15}{18}+\frac{2}{18}):3=\frac{29}{18}*\frac{1}{3}=\frac{29}{54} \\d)~(\frac{5}{3}+\frac{3}{4}+\frac{9}{8}):3 = ( \frac{40}{24}+\frac{18}{24}+\frac{27}{24}):3=\frac{85}{24}*\frac{1}{3} = \frac{85}{72}$

Answer 2

Răspuns:

Explicație pas cu pas:

b)

(1/2 + 2/3 + 3/4) / 3 = (6+8+9)/(12*3) = 23/36

c)

(2/3 + 5/6 + 1/9) / 3 = (12+15+2)/(18*3) = 29/54

d)

(5/3 + 3/4 + 9/8) / 3 = (40+18+27)/(24*3) = 85/72