1-variant uchburchakda balandlik va medianalar o’tkazilgan. Agar va bo’lsa, burchakni hisoblang

2-VARIANT

1. P(x) ko’phad uchun (x²+2)P(x)+ax+b=x⁷+2x⁵+3x⁴+3x³-2x+5 munosabat o’rinli bo’lsa, a+b=?

A) -23 B) 9 C) 12 D) 23

2. f(4)=3 va f^-1(2)=1 bo’lsa, (bunda f^-1(x)- funksiya f(x)-funksiyaga teskari funksiya.)

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

3. 2x²+4y²+z²+4xy+2x-4 ifodaning eng kichik qiymatini toping.

A) -5 B) 2 C) -3 D) -4

4. abc va ab sonlar mos ravishda uch va ikki xonali sonlar. Agar abc+ab=1073 bo’lsa, a+b+c=?

A) 16 B) 22 C) 21 D) aniqlab bo’lmaydi.

5. O’tmas burchakli uchburchakning eng katta tomoni 16 ga, qolgan ikki tomoni 8 va 3x+1 ga teng. Noma’lum x ning qabul qilishi mumkin bo’lgan eng katta butun qiymatini toping.

A) 3 B) 4 C) 5 D) 6

6. 3+7+11+…+4x-3=820 bo’lsa, x ni toping. A) 79 B) 20 C) 20,5 D) 41