Phân tích đa thức thành nhân tử

,$$\begin{gathered} \mathrm{A}.9{\mathrm{x}}^2+30\mathrm{x}+25 \\ \frac{4}{9}{\mathrm{x}}^4-16{\mathrm{x}}^2 \\ \mathrm{B}.\frac{12}{5}{\mathrm{x}}^2{\mathrm{y}}^2-9{\mathrm{x}}^4-\frac{4}{25}{\mathrm{y}}^4 \\ \mathrm{C}.{\mathrm{a}}^2{\mathrm{y}}^2+{\mathrm{b}}^2{\mathrm{x}}^2-2\mathrm{axby} \\ \mathrm{D}.64{\mathrm{x}}^2-{(8\mathrm{a}+\mathrm{b})}^2\mathrm{E}.100-{(3\mathrm{x}-\mathrm{y})}^2\mathrm{G}.27{\mathrm{x}}^3{\mathrm{a}}^3{\mathrm{b}}^3 \end{gathered}$$