Rút gọn biểu thức sau
A=\(\dfrac{1}{x-1}\sqrt{75\left(x-1\right)^3}\left(x>1\right) \)
B=\(5\sqrt{4x}-3\sqrt{\dfrac{100x}{9}}-\dfrac{4}{x}\sqrt{\dfrac{x^3}{4}}\left(x>0\right) \)
C=\(x-4+\sqrt{16-8x+x^2}\left(x>4\right)\)
Help me

1)Tìm x để căn thức sau có nghĩa
a)\(\sqrt{2x-4}\)              b)\(\sqrt{\dfrac{-7}{4-x}}\)
2) Tính
A=\(\sqrt{9+4\sqrt{5}}-\sqrt{9-4\sqrt{5}} \)
B=\(\left(\dfrac{\sqrt{14}-\sqrt{7}}{1-\sqrt{2}}+\dfrac{\sqrt{15}-\sqrt{5}}{1-\sqrt{3}}\right):\dfrac{1}{\sqrt{7}-\sqrt{5}}\)

Helpppp

Rút gọn P=\(\dfrac{15\sqrt{x}-11}{x+2\sqrt{x}-3}+\dfrac{3\sqrt{x}-2}{1-\sqrt{x}}-\dfrac{2\sqrt{x}+3}{\sqrt{x}+3}\)
helppp

giải pt sau
a)\(\sqrt[3]{2x+1}=3\)
b)\(\sqrt[3]{5+x}-x=5\)
c)\(\sqrt[3]{2-3x}=-2\)
d)\(\sqrt[3]{x-1}+1=x\)
Helpppp pls

https://hoc24.vn/cau-hoi/so-sanhmsqrt375sqrt2sqrt37-5sqrt2-voi-ndfrac4sqrt39.8270906673522 giúp mik với

So sánh
M=\(\sqrt[3]{7+5\sqrt{2}}+\sqrt[3]{7-5\sqrt{2}}\) với N=\(\dfrac{4}{\sqrt[3]{9}}\)