16. 2ˣ = 7 bo‘lsa, 12ˣ/3ˣ ning qiymatini toping.

Darajalar nisbatini birlashtiramiz: 12ˣ/3ˣ = (12/3)ˣ = 4ˣ = (2ˣ)² = 7².

Javob: 49.