Ответ:
- \((\sqrt{99}-\sqrt{44})\cdot\sqrt{11}=(3\sqrt{11}-2\sqrt{11})\cdot\sqrt{11}=11\).
- \((4\sqrt6-\sqrt{54}+\sqrt{24})\cdot\sqrt6=(4\sqrt6-3\sqrt6+2\sqrt6)\cdot\sqrt6=3\cdot6=18\).
- \((12-\sqrt7)(3+2\sqrt7)=36+24\sqrt7-3\sqrt7-14=22+21\sqrt7\).
- \((2\sqrt3+3\sqrt5)(3\sqrt3-2\sqrt5)=18-4\sqrt{15}+9\sqrt{15}-30=5\sqrt{15}-12\).
- Используем разность квадратов: \((\sqrt{14}-\sqrt{10})(\sqrt{14}+\sqrt{10})=14-10=4\).
- \((3\sqrt a+7\sqrt b)(3\sqrt a-7\sqrt b)=9a-49b\).
- \((\sqrt7+1)^2=7+2\sqrt7+1=8+2\sqrt7\).
- \((4\sqrt5-5\sqrt2)^2=80-40\sqrt{10}+50=130-40\sqrt{10}\).
Ответ: 1) 11; 2) 18; 3) \(22+21\sqrt7\); 4) \(5\sqrt{15}-12\); 5) 4; 6) \(9a-49b\); 7) \(8+2\sqrt7\); 8) \(130-40\sqrt{10}\).
