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[paranteza rotunda38xa+20icidem paranteza rotunda;25x54]-980=100
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Răspuns :

Răspuns:

[(38×a+120):25×54]-980=100

[(38×a+120):25×54]=100+980

(38×a+120):25×54=1080

(38×a+120):25=1080:54

(38×a+120):25=20

(38×a+120)=20×25

38×a+120=500

38×a=500-120

38×a=380

a=380:38

a=10