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Ally1
a fost răspuns

Determinati nr rational x stiind ca media aritmetica ponderata a numerelor 2,4,6,si x ,cu ponderile ,9,7,5 respectiv 3,este egala cu 4,1(6)

Răspuns :

Mikkka
Map = (2*9+4*7+6*5+x*3) : (9+7+5+3)
Map=(18+28+30+3x) : 24
Map= (76+3x) :24
(76+3x) :24=416-41/90
(76+3x) :24=375/90=25/6
76+3x=25/6 *24/1
76+3x= 25*4
3x=100-76
3x=24
x=24:3
x=8