cm rtđ 02/09/2021 Bởi Samantha cm rtđ { "@context": "https://schema.org", "@type": "QAPage", "mainEntity": { "@type": "Question", "name": " cm rtđ
Đáp án: \(\begin{array}{l}\left. \begin{array}{l}\dfrac{1}{{{R_1}}} + \dfrac{1}{{{R_2}}} > \dfrac{1}{{{R_1}}},\dfrac{1}{{{R_2}}}\\\dfrac{1}{R} = \dfrac{1}{{{R_1}}} + \dfrac{1}{{{R_2}}}\end{array} \right\} \Rightarrow \dfrac{1}{R} > \dfrac{1}{{{R_1}}},\dfrac{1}{{{R_2}}}\\ \Rightarrow R < {R_1},{R_2}\end{array}\) Bình luận
Đáp án:
\(\begin{array}{l}
\left. \begin{array}{l}
\dfrac{1}{{{R_1}}} + \dfrac{1}{{{R_2}}} > \dfrac{1}{{{R_1}}},\dfrac{1}{{{R_2}}}\\
\dfrac{1}{R} = \dfrac{1}{{{R_1}}} + \dfrac{1}{{{R_2}}}
\end{array} \right\} \Rightarrow \dfrac{1}{R} > \dfrac{1}{{{R_1}}},\dfrac{1}{{{R_2}}}\\
\Rightarrow R < {R_1},{R_2}
\end{array}\)