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Dexter6
a fost răspuns

determinați nr natural x care verifica egalitate [(15+75÷x)×13+500]÷20=38

Răspuns :

Gabi0205
Rezolvare: [(15+75÷x) ·13+500]÷20=38
(15+75÷x)·13+500=38·20
(15+75÷x)·13+500=760
(15+75÷x)·13=760-500
(15+75÷x)·13=260
15+75÷x=260÷13
15+75÷x=20
75÷x=20-15
75÷x=5
x=75÷5
x=15