Question

Hỹ chứng minh:\(\dfrac{F}{f}=\dfrac{S}{s}\)

Answer 1

Cũng đơn giản thôi !

Ta có :

\(\left\{{}\begin{matrix}P_1=\dfrac{f}{s}\\P_1=\dfrac{F}{S}\end{matrix}\right.\)

\(\Rightarrow\) \(\dfrac{f}{s}=\dfrac{F}{S}\rightarrow f.S=F.s\)

\(\rightarrow\) \(\dfrac{F}{f}=\dfrac{S}{s}\)

Answer 2

Ta có : \(P_1=\dfrac{f}{s}\) ; \(F_1=\dfrac{F}{S}\)

\(\Rightarrow\) \(\dfrac{f}{s}=\dfrac{F}{S}\) \(\rightarrow\) \(f.s=F.S\)

\(\Rightarrow\) \(\dfrac{F}{f}=\dfrac{S}{s}\)(đpcm)