2. Ikki sonning EKUBi va EKUKi, mos ravishda, 16 va 5760 ga teng. Agar sonlardan biri 640 ga teng bo‘lsa, ikkinchisini toping.

Yechish:

1. Ikki son ko‘paytmasi ularning EKUBi va EKUKi ko‘paytmasiga teng: \(a\cdot b=16\cdot5760=92160\).
2. Sonlardan biri 640 bo‘lgani uchun ikkinchi son: \(92160:640=144\).
3. Tekshiramiz: \(\operatorname{EKUB}(640,144)=16\), \(\operatorname{EKUK}(640,144)=5760\).

Javob: 144.