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baongoc031001
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60 điểm 2 câu A và B dễ thôi! Cho biểu thức M = ($\frac{\sqrt{a}+2}{a+2\sqrt{a}+1}$- $\frac{\sqrt{a}-2}{a-1}$) $\frac{\sqrt{a}+1}{\sqrt{a}}$ A)Tìm điều kiện xác định của a để M có nghĩa B)Rút gọn M *Yêu cầu: Càng chi tiết càng tốt. Ai chi tiết nhất cho ctlhn
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