Question

\(Cho:\frac{a}{k}=\frac{x}{a}và\frac{b}{k}=\frac{y}{b}.CMR:\frac{a^2}{b^2}=\frac{x}{y}\)

Answer 1

Ta có

\(\frac{a}{k}=\frac{x}{a}<=>a^2=x.k\)

\(\frac{b}{k}=\frac{y}{b}<=>b^2=k.y\)

=>\(\frac{a^2}{b^2}=\frac{x.k}{k.y}=\frac{x}{y}\)

tick nha

Answer 2

 

\(\frac{a}{k}=\frac{x}{a}\Leftrightarrow a^2=kx\)

\(\frac{b}{k}=\frac{y}{b}\Leftrightarrow b^2=ky\)

\(\frac{a^2}{b^2}=\frac{kx}{ky}=\frac{x}{y}\)