8-sinflar uchun test savollari. Online Matematika uzb

8-sinflar uchun test savollari . Online_Matematika_UZB.

1)xA)2y-2x B)2y C)2y-2z D)2z-2y

2) b ning qanday qiymatida quyidagi tengsizlik x ning ixtiyoriy qiymatida o’rinli bo’ladi? │x│>b

A)b<0 B)b=0 C)b>0 D)b≤0

3)Idishda ma’lum miqdorda suv bor.Agar idishda a litr suv quyilsa , idishning ¼ qismi to’ladi.Agar idishdagi dastlabki suvdan a litr olib tashlansa , idishning 0.15 qismi to’la bo’ladi. Dastlab idishning qancha qismi to’la bo’lgan?

A)0.5 B)0.1 C)0.2 D)0.15

4)Agar a²+3b²+2ab+2a+6b+3=0 bo’lsa, a+b=?

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

5) a ning qanday qiymatida x+y=a sistemaning yechimlari x<0,y>0 shartni qanoatlantiradi?

2x+y=3
A)a>3 B)a<3 C)a>2 D)a>-3

6)Tengsizlikni qanoatlantiruvchi eng katta butun sonni toping: 4-x < 1- 2x-1

3 4
A)-2 B)0 C)-1 D)1

7)│2x-3│=3-2x tenglamani yeching.

A)x<3/2 B)x=3/2 C)x≤3/2 D)08) 2x+7 = a + b bo’lsa, a+b=?

x²-2x-3 x-3 x+1
A)-3 B)-2 C)2 D)7

9) Qo’shtengsizlikni yeching: -15/2<(3-2x)/2<10

A)(-∞;-8,5) B)(-8,5;9) C)(-∞;-8,5)U(9;+∞) D)(-9;-8,5)

10)│3-x│+│2x-6│+4│x-3│=28 tenglamaning ildizlari yig’indisini toping:

A)6 B)4 C)3 D)8

11)16a²+9b²+4c²+3=8a+6b+4c, bo’lsa 1 ning qiymatini toping.

a+b+c
A)1/9 B)9 C)12/13 D)13/12

12)Ushbu (x-a)(x-b)≤0 tengsizlikning yechimlari to’plami [-3;6] oraliqda bo’lsa , a*b ning qiymatini toping.

A)Ǿ B)aniqlab bo’lmaydi C)-12 D)-18

3 __ 4 = 1

x y tenglamalar sistemasidan x*y =?
13) 2 + 5 =4,5
x y
A)4 B)6 C)3 D)2

14)-2
│-2-x│-│x-2│
A) 2 B)1 C)2/x D)x/2

15)x²+25≥0 tengsizlikni yeching .

A)x⋲Ǿ B)±5 C)[-5;5] D)x⋲R

16) x<4 a ning qanday qiymatida quyidagi tengsizliklar sistemasi yechimga ega bo’lmaydi ?

x>a

A)a<4 B)a≤4 C)a≥4 D)a>4

17) abcd , bcda , cdab va dabc 4 xonali sonlar yig’indisi quyidagilardan qaysi biriga qoldiqsiz bo’linadi?
A) 101 B)111 C)99 D)37

18)Qaysi tengsizlik x-ning har qanday qiymatida o’rinli?

A) 6x-x²≤2(1+4x²) B)3x²+8>18x-20
C)1-x²<2x+2 D)(x-1)(x-6)>(x-3)(x-4)

19) 7¹+7²+7³+…+7⁴³² yig’indi quyidagilardan qaysi biriga qoldiqsiz bo’linadi?

A)770 B)777 C)375 D)175

20) Agar a va b sonlar uchun a+b-2=0 bo’lsa, a³+b³+3a²b+3ab²-2a²-4ab-2b²+a+b-2=?

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

21)Agar x+2│y│=3 bo’lsa , x-2y ning qiymatini toping.

x-3y=5
A)-1 B)3 C)1 D)2

22)Tengsizlikni qanoatlantiruvchi butun sonlar nechta : │x+2│-│x│+│x-3│≤8

A)8 B)4 C)9 D)17

23)Agar (a-b):(a+b)=4:5 bo’lsa , (a²-b²)/ab ifodaning son qiymatini toping .

A)8/9 B)-73/9 C)-89/9 D)80/9

24)Tenglamani yeching : x-│x│=│x+1│

A)x>0 B)x<0 C)Ǿ D)R

25)│7-3x│-│8-2x│=0 tenglamaning ildizlari yig’indisini toping.

A)4 B)2 C)0 D)3