Rút gọn:
a)\(\sqrt{b^2-b+\frac{1}{4}}-\left(2b-\frac{1}{2}\right)vsb>=\frac{1}{2}\)
b)\(\frac{4x-5}{2\sqrt{x}-\sqrt{5}}vsx>0,xkhác\frac{5}{4}\)
c)\(\frac{\sqrt{x^2-2x+1}}{x-2}vsxkhác1\)
d) \(\frac{3-4x^2}{3+2x\sqrt{3}}vsxkhác\frac{-\sqrt{3}}{2}\)
Các bạn giúp mk nhé!!!