GIÚP TỚ VỚI Ạ ???????????????????????????????????????????????????? Question GIÚP TỚ VỚI Ạ ???????????????????????????????????????????????????? in progress 0 Môn Toán Adela 1 year 2020-11-04T08:17:40+00:00 2020-11-04T08:17:40+00:00 1 Answers 46 views 0
Answers ( )
Đáp án:
\(a.DK:x \ne \left\{ { – 2;1} \right\}\)
Giải thích các bước giải:
\(\begin{array}{l}
a.DK:x \ne \left\{ { – 2;1} \right\}\\
b.f\left( 0 \right) = \dfrac{{2.0 + 1}}{{0 + 2}} = \dfrac{1}{2}\\
f\left( 0 \right) = \dfrac{{\sqrt[3]{{2.0 + 1}}}}{{0 – 1}} = – 1\\
f\left( 2 \right) = \dfrac{{2.2 + 1}}{{2 + 2}} = \dfrac{5}{4}\\
f\left( 2 \right) = \dfrac{{\sqrt[3]{{2.2 + 1}}}}{{2 – 1}} = \sqrt[3]{5}\\
f\left( { – 1} \right) = \dfrac{{2.\left( { – 1} \right) + 1}}{{ – 1 + 2}} = – 1\\
f\left( { – 1} \right) = \dfrac{{\sqrt[3]{{2.\left( { – 1} \right) + 1}}}}{{ – 1 – 1}} = \dfrac{1}{2}\\
f\left( { – 3} \right) = \dfrac{{2.\left( { – 3} \right) + 1}}{{ – 3 + 2}} = 5\\
f\left( { – 3} \right) = \dfrac{{\sqrt[3]{{2.\left( { – 3} \right) + 1}}}}{{ – 3 – 1}} = \dfrac{5}{4}
\end{array}\)