Rút gọn biểu thức :
a) \(\dfrac{a\sqrt{b}+b\sqrt{a}}{\sqrt{ab}}\): \(\dfrac{1}{\sqrt{a}-\sqrt{b}}\)
b) (1+\(\dfrac{a+\sqrt{a}}{\sqrt{a+1}}\) ) . (1-\(\dfrac{a-\sqrt{a}}{\sqrt{a-1}}\))
c) \(\dfrac{a\sqrt{a}-8+2a-4\sqrt{a}}{a-4}\)
d) \(\dfrac{1}{2a-1}\) . \(\sqrt{5a^4\left(1-4a+4a^2\right)}\) ( a>\(\dfrac{1}{2}\))
Thanks mấy man trước nkoa 😊😊 😘😍