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calculati media aritmetica a numerelor a) 1 supra 2 si 7 supra 4,b) 3 supra 5 ; 4supra 9 si 1 supra 15 ,c) 3 supra 7 ,1 supra 14 si 2 supra 21

Calculati Media Aritmetica A Numerelor A 1 Supra 2 Si 7 Supra 4b 3 Supra 5 4supra 9 Si 1 Supra 15 C 3 Supra 7 1 Supra 14 Si 2 Supra 21 class=

Răspuns :

Liliadontul
a) (1/2+7/4)/2=(2/4+7/4)/2=(9/4)/2=9/8
b)  (3/5+4/9+1/15)/3=(4/9+9/15+1/15)/3=(4/9+10/15)/3=(60/135+40/135)/3=(100/135)/3=100/405=50/81
c)  (3/7+1/14+2/21)/3=(7/14+2/21)/3=(21/42+4/42)/3=25/42)/3=25/126

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