Ответ:
- \(\sqrt{72}-\sqrt{18}+2\sqrt2=6\sqrt2-3\sqrt2+2\sqrt2=5\sqrt2\).
- \(\sqrt{98}+\sqrt{72}-\sqrt{200}=7\sqrt2+6\sqrt2-10\sqrt2=3\sqrt2\).
- \(3\sqrt{12}+2\sqrt{27}-5\sqrt3=6\sqrt3+6\sqrt3-5\sqrt3=7\sqrt3\).
- \((\sqrt8-\sqrt2)^2=(2\sqrt2-\sqrt2)^2=2\).
- \((2\sqrt6-3)(2\sqrt6+3)=24-9=15\).
- \((\sqrt{15}+\sqrt2)(\sqrt{15}-\sqrt2)=15-2=13\).
