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[30+(12-2×b)×6]:2=27
Vã rog dau coroana.


Răspuns :

30+(12-2×b)×6=27×2=54 (12-2×b)×6=54-30=24 12-2×b=24:6=4 2×b=12-4=8 B=8:2 B=4