Răspuns: [1002:3-(100+a)×2]:14=408
[1002:3-(100+a)×2]:14=6
[1002:3-(100+a)×2]=6x14
1002:3-(100+a)×2=84
334-(100+a)×2=84
(100+a)×2=334-84
(100+a)×2=250
100+a=250:2
100+a=125
a=125-100
a=25
Explicație:
