Rút gọn bt A = \(\left(3\sqrt{7}+2\right).\sqrt{67-12\sqrt{17}}\)

\(x^5+x-34\ne0\)

Tìm x

\(\left(\frac{x}{x+3}-\frac{x^2+9}{x^2-9}\right):\) \(\left(\frac{3x+1}{x^2-3x}-\frac{1}{x}\right)\)

\(\frac{1}{x^4-x}:\frac{x+1}{x^3+x^2+x}\)

847 la sai mk nhan rui la 3388 moi dung