Bilimlar bellashuvi 2014

MATEMATIKA

7 SINF
III-variant

1. ni yeching.

A) 1 B) C) D) 2
2. 4 – 7 + 8 – 11 + 12 – 15 +…+ 96 – 99 ni hisoblang.

A)-72 B)-75 C)-80 D)-63

3. ni hisoblang.

A) 0,5 B) 1,5 C) 0,6 D) 0,3

4. Tenglamani yeching.

4,5-1,6

A)2 B)20 C)0,2 D)0,5
5. tenglamani yeching.

A) 4,5 B) 8 C) 17 D) 11

6. 5 ta sonning o’rta arifmetagi 13 ga teng. Shu sonlarga qaysi son qo’shilsa ularning o’rta arifmetigi 19 ga teng bo’ladi?
A) 49 B) 40 C) 46 D) 54
7. 4 – 7 + 8 – 11 + 12 – 15 +…+ 96 – 99 ni hisoblang.
A)-72 B)-75 C)-80 D)-63
8. Sayyoh muayyan masofaning 70% ini poezdda, 29,8% ini paroxodda bosib o’tgandan keyin, yo’loxirigacha yana 200 m qoldi.Sayyoh poezdda poezdda necha km yo’l bosgan?
A) 80 B) 70 C) 85 D) 75
9. ko’phadni ko’paytuvchilarga ajrating.

A)

B)

C)

D)
10. ni hisoblang.

A) 4 B) 16 C) 7,45 D) 12 E)

11. IV razryadli ishchi III razryadli ishchiga qaraganda 25% ko’p haq oladi.III razryadli ishchi IV razryadli ishchiga qaraganda necha foiz kam haq oladi?
A) 25 B) 20 C) 18 D) 15 E) 10
12. ni hisoblang.

A) 16,5 B) 10 C) 15,5 D) 9 E) 13,5

13. Ikki pristan(Qayiq to'xtash uchun qirg'oq bo'yiga tayyorlangan joy) orasidagi masofa 63 km. Bir vaqtning o’zida oqim bo’ylab birinchi pristandan sol, ikkinchisidan motorli qayiq jo’natildi va motorli qayiq solni 3 soatda quvib yetdi.Agar daryo oqimining tezligi 3 km/soat bo’lsa, qayiqning turg’un suvdagi tezligini toping.
A) 21 B) 20 C) 22 D) 19 E) 18
14. ni hisoblang.

A) 1,75 B) 2,75 C) 2,5 D) 2,25 E) 1,5

15. Asosi BC bo’lgan teng yonli ABC uchburchakning perimctri 40 sm va teng tomonli BCD uchburchakning perimetri 45 sm ga teng. AB va BC tomonlarni toping.

A) AB=12,5sm; BC=15sm;

B) AB=15sm; BC=12,5sm;

C) AB=12sm; BC=16sm;

D) AB=16sm; BC = l2sm;

16. ABC uchburchakning AD medianasi BC tomondan keyin DE=ADbo’lgan kcsmaga davom ettirilib, E nuqta B nuqta bilan tutashtirildi. Agar ACD=45°, ABD=35° bo’lsa, ABE ni toping.

A)80° B)10° C)75° D)70°

17. Umumiy AB asosga ega bo’lgan ACB va ADB uchburchaklar berilgan.

CD va AB lar 0 nuqtada ke sishadi. Agar DAB= CBA, CAB= DBA,

DB=24 sm bo’lsa, CA ni toping.

A)48sm B)12sm C) 24 sm D) 30 sm

18. Algebraik kasmi qisqartiring:

A) B) C) D)

_{19. Kas}rni qisqartiring:

20. Uchburchakning ikkila uchidagi tashqi burchaklari o’zaro teng va perimetri 74 sm, uning bir tomoni 16 sm ga tcng. Ikkita qolgan tomonlarini toping.

21. To’g`ri burchakli uchburchakning gipotenuzasiga tushirilgan mcdianasi 8 sm. Uchburchakning burchaklaridan biri 60° bo’lsa, bu burchakka yopishgan tomonlarini toping.

_{22. Ko’paytuvchilarga ajrating: 27a}³ + 8b

_23. Uchburchakning birinchi tomoni x sm, ikkinchisi undan 2 sm qisqa, uchinchisi birinchisidan 3 sm uzun.Shu uchburchakning perimetrini toping.

24. Birinchi brigada ishni 24 kunda, ikkinchisi esa 16 kunda tamomlay oladi.Agar birinchi brigada 4 kun ishlagach,unga ikkinchi brigada qo’shilsa,ular ishni necha kunda tamomlay olishadi.

25. Motorli qayiqning oqim bo’yicha tezligi 18 km/soat oqimga qarshi tezligi 14 km/ soat. Daryooqiminingtezliginivaqayiqningtezligini toping.