Toán Lớp 9: A=5/(√x+2) – (2√x-11)/(x-4) + 2/(2-√x)
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Toán Lớp 9: A=5/(√x+2) – (2√x-11)/(x-4) + 2/(2-√x)
Mình cần câu trả lời gấp ạ mình cảm ơn nhiều
Comments ( 1 )
A = \dfrac{5}{{\sqrt x + 2}} – \dfrac{{2\sqrt x – 11}}{{x – 4}} + \dfrac{2}{{2 – \sqrt x }}\\
= \dfrac{{5\left( {\sqrt x – 2} \right) – 2\sqrt x + 11 – 2\left( {\sqrt x + 2} \right)}}{{\left( {\sqrt x + 2} \right)\left( {\sqrt x – 2} \right)}}\\
= \dfrac{{5\sqrt x – 10 – 2\sqrt x + 11 – 2\sqrt x – 4}}{{\left( {\sqrt x + 2} \right)\left( {\sqrt x – 2} \right)}}\\
= \dfrac{{\sqrt x – 3}}{{x – 4}}
\end{array}$