Agar a, b, c musbat sonlar uchun \(\frac{ab}{c}=3\), \(\frac{bc}{a}=12\), \(\frac{ac}{b}=27\) tengliklar o‘rinli bo‘lsa, \(a+b-c\) ning qiymatini toping.

Berilgan tengliklarni juftlab ko‘paytiramiz:

\[a^2=\frac{ab}{c}\cdot\frac{ac}{b}=3\cdot27=81 \Rightarrow a=9,\]

\[b^2=\frac{ab}{c}\cdot\frac{bc}{a}=3\cdot12=36 \Rightarrow b=6,\]

\[c^2=\frac{bc}{a}\cdot\frac{ac}{b}=12\cdot27=324 \Rightarrow c=18.\]

Musbat sonlar berilgani sababli musbat ildizlar tanlanadi.

\[a+b-c=9+6-18=-3.\]

Javob: \(-3\).