Matematika. 8 sinf. Test savollari

Matematika. 8 sinf. Test savollari.
1. {-12; x} vektorning moduli 13 ga teng. x ning qiymatini toping.

A) 3 B) 4 C) D) 8

2. va vektorlarning skalyar ko`paytmasini toping.

A) 4 B) -70 C) -35 D) 14

3. va vektorlar berilgan. vektorning koordinatalarini toping.

A) {26;-30}B) {20;-15}C) {10;-6} D) {-30;20}

4. A(-5;4) va B(3;-6) nuqtalar berilgan. vektorning koordinatalarini toping.

A) {8;-10} B) {-8;10} C) {-2;-2} D) {-15;-24}

5. 70⁰ li markaziy burchak tashkil etgan ikki radisuning uchlariga o`tkazilgan urinmalar orasidagi burchakni toping.

A) 70⁰ B) 110⁰ C) 35⁰ D) 55⁰

6.Teng yonli uchburchakning yon tomoni 30 dm, asosiga tushirilgan balandlik esa 24 dm ga teng. Shu uchburchakka tashqi chizilgan aylananing radiusini toping.

A) 5,25 dm B) 18 dm C) 8 dm D) 12,4 dm

7. Teng yonli uchburchakning asosi 48 sm, yon tomoni 26 sm ga teng. Bu uchburchakka ichki chizilgan aylana radiusini toping.

A) 4,8 sm B) 10 sm C) 14 sm D) 9,6 sm

8. AB va BC – markazi O nuqtada bo`lgan aylananing vatarlari, . Agar aylana radiusi 12 sm ga teng bo`lsa, AC vatarning uzunligini toping.

A) 6 sm B) 24 sm C) 9 sm D) 12 sm

9. k ning qanday qiymatlarida (k-2)x² + 7x – 2k² = 0 tenglama x = 2 yechimga ega

A) 1; 3 B) 1; -3 C) -1; 3 D) -2;3

10. Ushbu y² – 2ty + t + 2 = 0 tenglama faqat bitta ildizga ega bo`ladigan t ning barcha qiymatlari yig`indisini toping.

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

11. k ning qanday musbat qiymatida 25x² + kx + 2 = 0 tenglama bitta ildizga ega bo`ladi?

A) B) 10 C) D) 5

12. m ning qanday qiymatlarida 2x² – (m-7)x – 8=0 tenglama ildizlari qarama –qarshi sonlar bo`ladi?

A) 7 B) -1 C) 1 D) -6

13. x²+px-12=0 tenglamaning ildizlaridan biri 3 ga teng. Shu tenglamaning p koeffitsiyentini toping.

A) -1 B) 1 C) 4 D) -4

14. a ning qanday qiymatlarida ax-5=a+7x tenglama yechimga ega bo`lmaydi?

A) a=5 B) a=7 C) a=0 D) a=-7

15. Ildizlari -3 va -4 bo`lgan keltirilgan kvadrat tenglama tuzing.

A) x²-7x+12=0 B) x²+7x+12=0 C) x²-7x-12=0 D) x²-x+7=0

16. 3x² -10x + 7 = 0 kvadrat tenglama nechta yechimga ega ?

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

17. m ning qanday qiymatlarida m²x – 6 = 36x + m tenglamaning ildizlari cheksiz ko`p bo`ladi ?

A) m=0 B)m= 6 C) m=-6 D) m=

18. n ning qanday qiymatlarida nx = 4x-7 tenglama yagona yechimga ega?

A) n B) n=4 C) n n

19. Ikki sonning ayirmasi 7 ga, ularning ko`paytmasi 120 ga teng. Shu sonlarni toping.

A) 15 va 8 B) 17 va 9 C) 24 va 5 D) 12 va 10

20. Tenglamalar sistemasini yeching:

A) X= 4, Y=1 B) X=1, Y= 6 C) X= -2, Y= -3 D) (2;3) va (3;2)

21.Sonni standart shaklda yozing: 0,000078

A) 7,8·10⁵ B) 7,8· 10^-5 C) 0,78·10^-4 D) 78·10^-6

22. Sonni yuzdan birgacha yaxlitlang. Yaxlitlashning nisbiy xatoligini toping: 5,7635.

A) 5,76; 0,8% B) 5,76 ; 0,9 % C) 5,77; 0,08 % D) 5,76; 0,06%

23. Tengsizlikni yeching: | x - 4 |< 7.

A) -3< x < 3 B) < x < 3 C) 4 < x < 7 D) -3 < x < 11

24. Tengsizlikni yeching: | x -1 | 1.

A)[0;2] B) x (-∞;0] U [2;∞) C) [-2;0] D) x (-∞;0) U (2;∞)

25. | 5x - 11 | = 4 tenglamaning ildizlari ko`paytmasini toping.

A) 4,2 B) 16 C) -4,2 D) -16