Toán Lớp 9: A=4 √x -x-4 / 5x-10 √x …..Rút gọn phân thức
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Toán Lớp 9: A=4 √x -x-4 / 5x-10 √x …..Rút gọn phân thức
Comments ( 1 )
A = 4\sqrt x – \dfrac{{x – 4}}{{5x – 10\sqrt x }}\\
= 4\sqrt x – \dfrac{{\left( {\sqrt x – 2} \right)\left( {\sqrt x + 2} \right)}}{{5\sqrt x \left( {\sqrt x – 2} \right)}}\\
= 4\sqrt x – \dfrac{{\sqrt x + 2}}{{5\sqrt x }}\\
= \dfrac{{20x – \sqrt x – 2}}{{5\sqrt x }}
\end{array}$