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afla nr necunoscut di expresia(100×d-110)÷39=10

Răspuns :

(100×d-110):39=10
100×d-110=39×10
100×d-110=390
100×d=390+110
100×d=500
d=500:100
d=5
(100×d-110):39=10
(100×d-110)=10×39
(100×d-110)=390
100×d=390+110
100×d=500
d=500:100
d=5

Sper ca te-am ajutat !!