2015-yilning variantlari Matematika (Informatika) javoblari bilan

Variant №129

1. ni hisoblang.

A)1/2 B) 2 C)1/4 D) 1

2. |x -5ax|=15a tenglama uchta haqiqiy yechimga ega bo’ladigan a ning qiymati necha?

A) 1 B) 2 C)3 D) 0

3. (x;y) sonlar jufti tenglamalar sistemasining yehimi bo'lsa, 6x+y ning qiymatini toping.

A) 1 B ) 0 C)-2 D) -1

4. To’g’ri chiziq doira aylanasini uzunliklarining nisbati 1:3 kabi bo’lgan 2 yoyga ajratadi. Bu chiziq doiraning yuzini qanday nisbatda bo’ladi?

A) B) D) 1:9 C)

5. ctg2α-ctgα ni hisoblang.

A) - B) C) D)

6. 7¹⁶ +7¹⁴ yigindi qiymatining natural bo'luvchilari sonini toping.

A) 100 B ) 255 C)90 D)30

7. To'g'ri burchakli uchburchakda bir burchagi 60° ga teng,kichik tomoni esa 3√3 bo'lsa,uchburchakning perimetrini toping

A)3√3+5 B) 11√3 C) 2√3+3√3 D)9(√3+1)

8. tengsizlikning eng katta manfiy butun yechimining eng kichik musbat yechimiga nisbatini toping

A)-1/2 B)-1/5 C) -1/4 D) -1/3

9. Muntazam oltiburchakning tomoni √108 sm bo'lsa, unga tashqi va ichki chizilgan aylana radiuslarining nisbatini toping.

A) B) C) D)

10. Agar 2 ≤ x ≤y≤ z≤t≤ 128 bo’lsa ifodaning eng kichik qiymatini toping.

A) 0.75 B) 1.6 C) 0,5 D) 0.25

11. f(x+2)=2(2(f(x)+1)), f(2)=4 f(6)=?

A) 46 B ) 72 C) 74 D)66

12. 4,6(6) soni marta orttirilgan bo’lsa, u qanchaga ortgan?

A) 5,(3) B) 6,(3) C) 6,(3) D) 5,3

13. Arifmetik progressiyada a₁+a₃+a₅+...+a₉=50, a₂+a₄+a₆+...+a₁₀=75 bo'lsa, d ni toping.

A) 6 B ) 5 C)15 D) 13

14.