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10% reducere
x=pretul initial
1080lei=pretul final
Aflati: reducere? lei


Răspuns :

[100-10]/100 ·x=1080[lei];
⇒90/100 ·x=1080
⇒x=1080/90/100
⇒x=1080·100/90
⇒x=1080·10/9
⇒x=120·10
⇒x=1200[lei-pretul initial ,inainte de reducere];
⇒1200-1080=120[lei-reducerea];