O`quv yili i-yarim yillik yakuni bo`yicha 2-blok 8-sinf tarix

2017-2018 O`QUV YILI I-YARIM YILLIK YAKUNI BO`YICHA 2-BLOK
8-SINF MATEMATIKA

1. a=2,4, b=3,6, h=1,6 bo’lsa, S= ifodaning son qiymatini toping.

a) 48 b) 3,18 c) 0,48 d) 4,8.
2. Qavslarni oching va soddalashtiring: 5a + (3a - (4a + 3)).
a) 8a + 3 b) 4a – 3 c) - 4a – 3 d) 4a + 3.
3. Tenglamani yeching: 8 (x + 2) – 5x = - 2 (x + 4,5).
a) – 5 b) 5 c) 6 d) to’g’ri javob yo’q.
4. Hisoblang: . a) 3 b) c) d) .
5. birhadni son qiymatini tiping, bunda a = - 2, b = - 1, c = 10.
a) b) c) – 8 d) 8.
6. birhadni standart shaklda yozing:
a) b) c) d) .
7. Ko’phadni birhadga ko’paytiring: .
a) b) c) d) .

8. Ko’phadni ko’paytiring : (a+2b)(a-2b)

a) a - 4b b) a² - 4b² c) a² + 4b² d) a² – b².
9. Umumiy ko’paytiruvchini qavsdan tashqariga chiqaring :
24a³b² – 30 a²b³
a) 6a²b³ (4a – 5b) b) 6ab (4a²b – 5ab²) c) 6a²(4b - 5) d) 3(a² – b³)
10. Hisoblang: .
a) 169 b) 1.69 c) 16.9 d) – 1.69
11. k ning qanday qiymatida tenglamalar sistemasi yechimga ega emas?
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12. а ning qanday qiymatida tenglamalar sistemasi yechimga ega emas?
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13. Tenglamalar sistemasini algebraik qo‘shish isulida yeching:
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14. Tenglamalar sistemasini yeching:
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15. Lola va oyisi birgalikda 110 chuchvara tayyorladilar, bunda Lola 2 soat, oyisi 3 soat ishladilar. Agar ular 1 soatda birgalikda 43 chuchvara tayyorlagan bo‘lsalar, ularnung har biri nechtadan chuchvara tayyorlaganlar ?
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