Đáp án:

Giải thích các bước giải:

`P=(1+(\sqrt{a})/(a+1)) : (1/(\sqrt{a}-1) - (2\sqrt{a})/(a\sqrt{a}+\sqrt{a}-a-1))` `(a >= 0; a \ne 1)`

`P=((a+1)/(a+1) + (\sqrt{a})/(a+1)) : (1/(\sqrt{a}-1) - (2\sqrt{a})/(\sqrt{a}(a+1)-(a+1)))`

`P=(a+1+\sqrt{a})/(a+1) : (1/(\sqrt{a}-1) - (2\sqrt{a})/((a+1)(\sqrt{a}-1)))`

`P=(a+1+\sqrt{a})/(a+1) : ((a+1)/((\sqrt{a}-1)(a+1)) - (2\sqrt{a})/((a+1)(\sqrt{a}-1)))`

`P=(a+1+\sqrt{a})/(a+1) : (a+1-2\sqrt{a})/((\sqrt{a}-1)(a+1))`

`P= (a+1+\sqrt{a})/(a+1) : (\sqrt{a}-1)^2/((\sqrt{a}-1)(a+1))`

`P=(a+1+\sqrt{a})/(a+1) : (\sqrt{a}-1)/(a+1)`

`P=(a+1+\sqrt{a})/(a+1).  (a+1)/(\sqrt{a}-1)`

`P=(a+1+\sqrt{a})/(\sqrt{a}-1)`