8-sinf i-varinat

8-sinf
I-varinat.
1.Soddalashtiring: (6a-2b) –(2b+6a)
A)-4b B)12a-4b C)12a D)4b-4a
2.2·(3+ = 8 –x tenglamani yeching:
A)2 B)1 C)3 D)8
3.y = 2x-5 funksiya grafigiga qaysi nuqta tegishli?
A)(2;1) B)(3;1) C)(0;5) D)(1;3)
4.Agar B (2;6) nuqta y=kx+8 funksiya grafigiga tegishli bo’lsa, k-ni toping.
A)2 B)-1 C)6 D)1
5.y(x) = 2x +1 funksiya grafigi qaysi chorakdan o’tadi?
A)1;2;3 B)1;3;4 C)2;3;4 D)3;4.
6 .Agar x va y 3x+2y =8 sistema
x+2y =4 yechimi bo’lsa, x ·y ni toping.
A)4 B)2 C)3 D)6
7. |4x+2| ≤6 tengsizlikning nechta butun yechimi bor?
A)3 B)4 D)6.
8.x₁, x₂; x²-3x -4 =0 tenglamaning ildizlari bo’lsa, x₁·x₂+(x₁+x₂)ni toping.
A)-1 B)7 C)1 D)3.
9.x²-7x+12 =0 tenglamaning ildizlar ko’paytmasini toping.
A)7 B)12 C)6 D)0.
10.Hisoblang.

A)2 B)1 C)4 D)16.
11.Tengsizlikning eng katta butun yechimini toping.
6(x-3) < 2 ·(x+1)
A)4 B)5 C)6D)2.
12.Tengsizliklar sistemasini yeching.
2x+5≤0
9x-18≥0
A)yechimi yo’q B)x ≤ - 2,5 C)x ≥ 2 D) x≤-25; x ≥2.
13.x²+3x =0 tenglamani yeching:
A)3 va 0 B)3 C)0 D)0 va -3.
14.Hisoblang: ( 3
A)35 B)25 C) D)
15.Rombning diagonallari 8 va 6 sm ga teng bo’lsa, romb perimetrini toping.
A)40 B)20 C)30 D)10.
16.Uchburchak burchaklarning nisbati 1;2;3 kabi katta burchakni toping.
A)90⁰ B)80⁰ C)110⁰ D)100⁰
17.Trapetsiya asoslari 8 va 12 ga teng. Trapetsiya o’rta chizig’ini toping:
A)10 B)2 C)8 D)4.
18.Parallelogrammning ikkita burchaklar yig’indisi 100⁰ ga teng. Parallelogrammning katta burchagini toping.
A)150⁰ B)130⁰ C)120⁰ D)110⁰
19.To’g’ri burchakli uchburchakning perimetri 84 ga, asosi 17 ga , gepotenuzasi 37 ga teng. Bu uchburchakning yuzini toping.
A)510 B)255 C) 810 D)405
20.Teng yonli uchburchakning asosi 18 ga, yuzi 108 ga teng bo’lsa, uning balandligini toping.
A) 6 B) 12 C) 14 D) 23