Agar a, b, c musbat sonlar uchun \(\frac{ab}{c}=2\), \(\frac{bc}{a}=18\), \(\frac{ac}{b}=8\) tengliklar o‘rinli bo‘lsa, \(a+b-c\) ning qiymatini toping.

Berilgan tengliklarni ko‘paytiramiz:

\[\frac{ab}{c}\cdot\frac{bc}{a}\cdot\frac{ac}{b}=2\cdot18\cdot8.\]

Chap tomon \(abc\) ga teng, shuning uchun:

\[abc=288.\]

Endi tengliklardan foydalanamiz:

\[a^2=\frac{ab}{c}\cdot\frac{ac}{b}=2\cdot8=16 \Rightarrow a=4,\]

\[b^2=\frac{ab}{c}\cdot\frac{bc}{a}=2\cdot18=36 \Rightarrow b=6,\]

\[c^2=\frac{bc}{a}\cdot\frac{ac}{b}=18\cdot8=144 \Rightarrow c=12.\]

Musbat sonlar berilgani uchun musbat ildizlar olindi.

\[a+b-c=4+6-12=-2.\]

Javob: \(-2\).