Toán Lớp 8: (x^2 – 4x)/(16 – x) rút gọn nha
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Toán Lớp 8: (x^2 – 4x)/(16 – x) rút gọn nha
Comments ( 2 )
\dfrac{{{x^2} – 4x}}{{16 – {x^2}}}\\
DKXD:\left\{ \begin{array}{l}
x \ne 4\\
x \ne – 4
\end{array} \right.\\
\Leftrightarrow – \dfrac{{x\left( {x – 4} \right)}}{{\left( {{x^2} – {4^2}} \right)}}\\
\Leftrightarrow – \dfrac{{x\left( {x – 4} \right)}}{{\left( {x – 4} \right)\left( {x + 4} \right)}}\\
\Leftrightarrow \dfrac{{ – x}}{{x + 4}}
\end{array}\]