7-sinf matematika I variant

19. Birhadlarni ko’paytiring. ab3c · bcaa2=
Javob: __________________________

20. Ko’phadni standart shakliga keltiring.
3a2 b - 8b2 - 5a2b + 6b2 + 3a2b - 2c2
Javob: __________________________

21. Amalni bajaring. (12ab²-18a) : 4ab
Javob: __________________________

22. Algebraik ifodaning son qiymatini toping. 3x-2y², bunda x= -2, y=3
Javob: __________________________

23. AC va MN kesmalar O nuqtada kesishadi. O nuqta AC va MN kesmalarning o’rtasi va MC=9 m bo’lsa, AN kesmaning o’rtasini toping?
Javob: __________________________