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[(a-8000):50+900]:4=250

Răspuns :

[(a-8000):50+900]:4=250/×4
(a-8000):50+900=1000/-900
(a-8000):50=100/×50
a-8000=5000/+8000
a=13000
[(a-8000):50+900]:4=250
Se foloseste metoda mersului invers:
(a-8 000):50+900=250x4
(a-8 000):50+900=1 000
(a-8 000):50=1000-900
a-8 000=100x50
a-8000=5 000
a=5000+8 000
a=13 000