Question

giúp nha

Answer 1

\(\frac{a^2}{b^2}=\frac{ac}{bd}\) đúng

Answer 2

\(\frac{a}{b}=\frac{c}{d}\) =.> \(\frac{a}{b}.\frac{a}{b}=\frac{c}{d}.\frac{c}{d}\rightarrow\frac{a^2}{b^2}=\frac{c}{d}.\frac{a}{b}\Rightarrow\frac{a^2}{b^2}=\frac{ac}{bd}\)

Answer 3

\(\frac{a}{b}=\frac{c}{d}\Rightarrow\frac{ad}{bc}=\frac{a^2}{b^2}\)