Question

Dublam un numar si adaugam apoi 10.Dublam apoi rezultatul si adaugam 10. Dublam noul rezultat ,adaugam 10 si obtinem 270. Aflati numarul .


DAU COROANA !!!!!!

Answer 1

[(a×2+10)×2+10]×2+10=270

[(a×2+10)×2+10]×2=270-10

[(a×2+10)×2+10]×2=260

(a×2+10)×2+10=260:2

(a×2+10)×2+10=130

(a×2+10)×2=130-10

(a×2+10)×2=120

a×2+10=120:2

a×2+10=60

a×2=60-10

a×2=50

a=50:2

a=25

Answer 2

numarul = "a"
a x 2 + 10 = "b"
b x 2 + 10 = 270
a = ?

b x 2 = 270 -10
b x 2 = 260
b = 260 : 2
b = 130

a x 2 + 10 = 130
a x 2 = 130 - 10
a x 2 = 120
a = 120 : 2
a = 60

Raspuns : a = 60