17, 19, 21, 23, 27, 29, 31 sonlaridan tub sonlarni ajratib yozing.
- A. 18, 19, 23, 29, 31
- B. 17, 19, 23, 29, 31
- C. 17, 19, 23, 29, 31, 15
- D. 17, 19, 29, 31
Bo'linish belgilari, tub va murakkab sonlar bo‘yicha savol
Javob va yechimni ko‘rish
Javob: 17, 19, 23, 29, 31
Berilgan ro‘yxatda har bir sonni tubligini tekshiramiz. Tub son – 1 va o‘zi bilan bo‘linadigan, boshqa natural bo‘luvchilari bo‘lmagan son.
- $17$ ni $2,3,5$ ga bo‘lganda qoldiq qoladi → tub son.
- $19$ ham $2,3,5$ ga bo‘lganda qoldiq qoladi → tub son.
- $21$ ni $3$ ga bo‘lganda $21=3\cdot7$, demak tub emas.
- $23$ $2,3,5$ ga bo‘lganda bo‘linmaydi → tub son.
- $27$ $3$ ga bo‘linadi ($27=3\cdot9$) → tub emas.
- $29$ $2,3,5$ ga bo‘linmaydi → tub son.
- $31$ $2,3,5$ ga bo‘linmaydi → tub son.
Shunday qilib, tub sonlar $17,\,19,\,23,\,29,\,31$ bo‘lib, to‘g‘ri javob **B** variantidir.
Mavzuni mustahkamlang
Bu savol Bo'linish belgilari, tub va murakkab sonlar mavzusiga tegishli. Ta’riflar, formulalar va misollarni mavzu sahifasida ko‘ring.
Mavzuni o‘rganish