B1, P=(
a, rút gọn P

B2, P=(
a, Rút gọn P

B1:Thực hiện phép tính
a, A= \(\sqrt{(1-\sqrt{2)}^2}-\sqrt{18}\)
b, B=\(\frac{\sqrt{2}-2}{1-\sqrt{2}}+\sqrt{50}\)
c, C=\(\frac{3}{\sqrt{2}-1}-\frac{3}{\sqrt{2}+1}\)

B1, P=(\(\frac{1-a\sqrt{a}}{1-\sqrt{ }a}+\sqrt{a})(\frac{1+a\sqrt{a}}{1+\sqrt{a}}-\sqrt{a})\)
a, rút gọn P

B2, P=(\(\frac{2\sqrt{x}}{\sqrt{x}+3}+\frac{\sqrt{x}}{\sqrt{x}-3}_{ }-\frac{3x+3}{x-9}):(\frac{2\sqrt{x}-2}{\sqrt{x}-3}-1)\)
a, Rút gọn P

\(\sqrt{6+2\sqrt{ }5}_{ }-\sqrt{9+4\sqrt{ }5}\)
\(\sqrt{^{^{ }}x^2-6x+9}vớix_{ }>3\)