Bilimlar bellashuvi 2014

MATEMATIKA
8-sinf

II-variant

1. x₁, x₂; x²-3x -4 =0 tenglamaning ildizlari bo’lsa, x₁·x₂+(x₁+x₂) ni toping.
A) -1 B) 7 C) 1 D) 3

2. Tengsizlikning eng katta butun yechimini toping. 6(x-3) < 2 ·(x+1)

A) 6 B) 5 C) 4 D) 2

3. _{ } tenglamaning ildizlari kvadratlarining yig‘indisini toping ?

A) 4 B) 18 C) 16 D) 6

4. ABCD to‘g‘ri to‘rtburchakni ikkita o‘zaro perpendikulayar to‘g‘ri chiziqlar to‘rtta , yuzlari S₁, S₂, S₃ va S₄ ga teng bo‘lgan to‘g‘ri to‘rtburchaklarga ajratadi. S₁=4 sm², S₂=8 sm², S₄=10 sm² bo‘lsa, S₃ ni toping.

A) 20 sm² B) 22 sm² C) 24 sm² D) 26 sm²
5. bo‘lsa
A)2/5 B)1 C)5 D)-2/5

6. ni soddalashtiring.

A) B) C)m+1 D)m-1

7. ni hisoblang

A)10 B)9 C)8 D)7

8. 6x-a-6 = (a+x)(x+2) tenglama a ning qanday qiymatida yechimga ega emas?

A)6 B)10 C)5 D)4

9. To‘g‘ri to‘rtburchakning perimetri 30m, yuzi esa 56m² ga teng. Uning bo‘yi enidan necha dm ga uzun?

A)12 B)1 C)10 D)5
10. 4a²+9b²+16c²-4a-6b-8c+3=0 ifoda eng kichik qiymatni qabul qilganda abc ga teskari sonni toping.
A)16 B)32 C)15 D)24

11. irratsionallikni yo‘qoting.

A) 2+ B) C) D)
12. Parallelogrammning tomonlari 7 va 18 ga teng. Uning katta tomoniga yopishgan burchaklari bissektrisalari qarshisidagi tomonni 3 ta qismga ajratadi. Shulardan kichigini uzunligini toping.
A) 6 B) 7 C) 5 D) 4
13. Hisoblang: _{ }
A) 7+2√6 B) 3√6+1 C) 4√3+ D) 3√3-1

14. Ikki soning yig`ndisi √35 ga, ularning ayirmasi √31 ga teng. Shu sonlarning ko`paytmasi nechaga teng?

A) 31√5 B) 1 C) 6 D) 35√3
15. Rombning balandligi 5ga, dioganallarning ko`paytmasi 80ga teng. Uning peremetrini toping.
A) 32 B) 16 C) 24 D) 28
16. y=ax+b yunksiyaning grafigi A(2;3) va B(-2;5) nuqtalardan o’tsa, a va b ni toping:
А) а = 0,5 b = 4
B) а = - 0,5 b = 4
C) а = - 0,5 b = - 4
D) а = 0,5 b = - 4

17. Agar tezlik 25% ga orttirilsa, vaqt necha foizga kamayadi?

А) 25% B) 30% C) 20% D)15%

18. Agar bo’lsa, xy ning qiymatini toping.

A) 36 B) 42 C) 25 D) 81 E) 16

19. ABC uchburchakka aylana ichki chizilgan. AB=6 sm, BC=7 sm, AC=8 sm. K nuqta AB tomonda yotadi. K nuqta aylana bilan urinish nuqtasi bo’lsa, AK ni toping.

20. ABCD rombning dioganallari d₁ va d₂ gat eng.Katta diagonal AC ga E nuqta olingan va AE:EC =4:1 AEDuchburchak yuzini toping.

21. Uchburchakning perimetri 108 ga teng, uchlari berilgan uchburchak tomonlarining o’rtalarida bo’lgan uchburchakning perimetrini toping.

22. Kvadratning yuzi 196 dm². Kvadratning perimetrini toping.

23. Tengsizlikni qanoatlantiruvchi eng kichik butun sonni toping: n -12,3

24. Оtasi 48 yoshda o’g’li esa 14 yoshda necha yildan keyin оtasi o’g’lidan 3 marta katta bo’ladi.

25. Ifodani soddalashtiring: _{ } + _{ } + …+ _{ }