\(a,Gọi.CTHH.chung.Ag_xO_y\\ Theo.quy.tắc.hóa.trị,ta.có:x.I=y.II\\ Chuyển.thành.tỉ.lệ:\dfrac{x}{y}=\dfrac{2}{1}\Rightarrow\left\{{}\begin{matrix}x=2\\y=1\end{matrix}\right.\\ CTHH:Ag_2O\)
\(b,Gọi.CTHH.chung:Al_x\left(OH\right)_y\\ Theo.quy.tắc.hóa.trị,ta.có:x.III=y.I\\ Chuyển.thành.tỉ.lệ:\dfrac{x}{y}=\dfrac{1}{3}\Rightarrow\left\{{}\begin{matrix}x=1\\y=3\end{matrix}\right.\\ CTHH:Al\left(OH\right)_3\)
\(Gọi.CTHH.chung:Ca_x\left(PO_4\right)_y\\ Theo.quy.tắc.hóa.trị,ta.có:x.II=y.III\\ Chuyển.thành.tỉ.lệ:\dfrac{x}{y}=\dfrac{3}{2}\Rightarrow\left\{{}\begin{matrix}x=3\\y=2\end{matrix}\right.\\ CTHH:Ca_3\left(PO_4\right)_2\)