(8c+12)(3c-1)+(3c+2)(-5c-6) если c=1 целая 1/3

Question

(8c+12)(3c-1)+(3c+2)(-5c-6) если c=1 целая 1/3

Answer 1

(8с+12)(3с-1)+(3с+2)(-5с-6)=(8с+12)(3с-1)-(3с+2)(5с+6)=24с²-8с+36с-12-(15с²+18с+10с+12)=24с²-8с+36с-12-15с²-18с-10с-12=9с²-24

с=1 1/3

9*(1 1/3)²-24=9*16/9-24=16-24=-8

Ответ: -8