Question

[nguyenvuthuuyen]

cho a/k=x/a ; b/k=y/b .chứng minh a^2/b^2=x/y
 

Answer 1

[Moon Light]

a/k=x/a

=>a.a=x.k

=>a²=kx

b/k=y/b

=>b.b=y.k

=>b²=yk

=>\(\frac{a^2}{b^2}=\frac{kx}{ky}=\frac{x}{y}\left(đpcm\right)\)