Giải thích các bước giải:
`a)`
`x/15 = 60/x`
`=>x.x=15.60`
`=>x^2=900`
`=>`\(\left[ \begin{array}{l}x^2=30^2\\x^2=(-30)^2\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=30\\x=-30\end{array} \right.\)
`b)`
`x/24 = 6/x`
`=>x.x=24.6`
`=>x^2=144`
`=>`\(\left[ \begin{array}{l}x^2=12^2\\x^2=(-12)^2\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=12\\x=-12\end{array} \right.\)
