9.
计算:
\((1) \dfrac{{x}^{2}}{x-y}- \dfrac{{y}^{2}}{x-y} \) \((2)\) .\( \dfrac{2{b}^{2}}{a+b}-a+b \)
\((3){\left( \dfrac{y}{6{x}^{2}}\right)}^{2}÷{\left(- \dfrac{{y}^{2}}{4x}\right)}^{2} \) \((4) \sqrt{6}-\left(2 \sqrt{ \dfrac{3}{2}}-3 \sqrt{ \dfrac{2}{3}}\right)- \sqrt{24} \)
\((5)\left(2 \sqrt{5}+3 \sqrt{2}\right)\left(2 \sqrt{5}-3 \sqrt{2}\right) _{\;\;\;\;\;\;\;\;\;\;\;\;\;\;}(6)\left|- \sqrt{2}\right|- \sqrt{8}+{\left(1- \sqrt{3}\right)}^{0}+ \dfrac{1}{ \sqrt{2}+ \sqrt{3}} \)