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Matematika olimpiada Viloyat 2021-2022 o'quv yili

11-sinf Matematika olimpiada №3

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Avgust 19, 2024

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11-sinf Matematika olimpiada №3

2021-2022 o'quv yilida viloyat bosqichida tushgan savollar

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1. Doiraga ichki chizilgan kvadrat undan yuzasi $2\pi-4$ ga teng bo‘lgan segmentni ajratadi. Kvadratning yuzasini toping.

A) 8

B) 2

C) 16

D) 4

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2. Poyezd 3 minutda 7 kilometrmasofani , motosikl 5 minutda 7 kilometrmasofanibosibo`tdi. Mototsikltezligipoyezdtezliginingnecha % initashkilqiladi?

A) 61%

B) 70%

C) 71%

D) 60%

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3. 80 ni qanday musbat butun songa bo‘lganda, hosil bo‘ladigan qoldiq bo‘linmaning 25%iga teng bo‘ladi?

A) 19

B) 21

C) 10

D) 11

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4. Soddalashtiring:

A) 3cos2x

B) cosx

C) 3cosx

D) 3sin2x

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5. Soddalashtiring:

A) 2sinα

B) 1

C) 2

D) cosα

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6. АВС uchburchak ∠C=60° burchagining bissektrisasi 5√3 ga teng. Agar АС : ВС = 5 :2 bo‘lsa, ВС ni toping.

A) C

B) D

C) A

D) B

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7. Uchburchakning tomonlari 10, 24 va 26. Aylananing markazi uchburchakning katta tomonida yotadi va ikki kichik tomonlari bu aylanaga urinadi. Aylana radiusini toping.

A) 60/7

B) 120/17

C) 20/3

D) 260/17

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8. Hisoblang: 1 + 2 ∙ 2 + 3 ∙ 2² + 4 ∙ 2³+. … + 100 ∙ 2⁹⁹

A) C

B) A

C) D

D) B

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9. Tenglamalar sistemasi nechta yechimga ega?

A) 12

B) 6

C) 10

D) 8

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10. Hisoblang: (1 − tg5°)(1 − tg20°)2 + 2(2tg20° + tg5°)

A) 1

B) 2

C) 4

D) 3

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11. Quyidagi sonlar orasidan musbat sonni aniqlang.

A) A

B) B

C) D

D) C

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12. Ikki xonali sonni qandaydir natural songa bo‘lganda bo‘linmada 3 va qoldiqda 8 hosil bo‘ladi. Agar bo‘linuvchining raqamlari o‘rni almashtirilsa va bo‘luvchi son o‘zgarishsiz qoldirilsa, u holda bo‘linmada 2 va qoldiqda 5 hosil bo‘ladi. Bo‘linuvchning dastlabki qiymatini toping.

A) 73

B) 65

C) 53

D) 55

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13. (?²+ 4? + 8)² + 3?³ + 14?² + 24? = 0 tenglamaning ildizlari yig’indisini toping.

A) -7

B) -6

C) -11

D) -5

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14. Aylananing ОА, ОВ, ОС radiuslari o‘tkazilgan. Agar bo‘lsa, АОВ burchakni toping.

A) 120°

B) 90°

C) 30°

D) 60°

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15. To‘g‘ri burchakli uchburchakka ichki va tashqi chizilgan aylana radiuslari nisbati 2 : 5 bo‘lsa, uchburchakning katta o‘tkir burchagining kosinusini toping.

A) 0.2

B) 0.5

C) 0.6

D) 0.8

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16. Aylanaga АВС uchburchak ichki chizilgan. Uchburchakning СС1medianasining davomi aylanani ? nuqtada kesib o‘tadi. ni toping.

A) 1

B) 2

C) √5

D) 4

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17. Agar ? + 4/√?= 17 bo‘lsa, ? + 4√? ni toping.

A) 4

B) 2

C) 1

D) 3

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18. Teng yonli АВС uchburchakda: АВ = ВС = 25 sm va АС = 14 sm. ВС tomonga AD balandlikning D asosida urinuvchi va АС tomon o‘rtasidan o‘tuvchi aylana radiusini toping.

A) 175/48

B) 3

C) 211/47

D) 177/48

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19. Hisoblang:

A) 1

B) 2

C) 1.5

D) 0

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20. Agar ?(?) = ?²⁰²¹ + 3?²⁰²⁰ + 3?²⁰¹⁹ − ?²⁰¹⁸ + 1 bo‘lsa, ni toping.

A) 0

B) 1

C) 2

D) 3

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21. Agar a = √5 + 1 va b = √5 − 1 bo‘lsa, 2a² − ab − a² ifodaning qiymatini toping.

A) 6√5 + 1

B) √5 + 6

C) 6√5 + 2

D) 3√5 + 6

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22. Sektor perimetri 28 sm ga teng, uning yuzi esa 49 sm2. Sektor yoyining uzunligini toping.

A) 18 sm

B) 12 sm

C) 14 sm

D) 7 sm

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23. Soddalashtiring:

A) IV

B) I

C) III

D) II

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24. 100 dan kichik musbat butun sonlar orasida 2 ga ham, 3 ga ham, 7 ga ham bo‘linmaydigan nechta son mavjud?

A) 28

B) 29

C) 27

D) 26

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25. АВCDE beshburchak berilgan, М, N, Р va Q nuqtalar —АВ, ВС, CD va DE tomonlarning o‘rtalari. Agar U va V — МP? va NQ ning o‘rtasi bo‘lsa, АЕ: UV nisbatni toping.

A) 6

B) 5

C) 3

D) 4