Cho B=$\huge 1+\binom{\frac{2a+\sqrt{a}-1}{1-a}-\frac{2a\sqrt{a}-\sqrt{a}+a}{1-a\sqrt{a}}}{}$$\huge *\frac{a-\sqrt{a}}{2\sqrt{a}-1}$
a)Rút gọn B
b)Chứng minh rằng B>$\huge \frac{2}{3}$
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