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Представь в виде многочлена.
\(\left(\dfrac{1}{5}x^2+\dfrac{1}{3}y\right)\) \(\left(\dfrac{1}{25}x^4 -\dfrac{1}{15}x^2y + \dfrac{1}{9}y^2\right)=\left(\dfrac{1}{5}x^2\right)^3+\left(\dfrac{1}{3}y\right)^3=\dfrac{1}{125}x^6+\dfrac{1}{27}y^3\) .
а) \(\left(\dfrac{1}{7}m^6-\dfrac{7}{9}n\right)\left(\dfrac{1}{49}m^{12}+\dfrac{1}{9}m^6n+\dfrac{49}{81}n^2\right)=\) [ ];

б) \((0,4a^6+0,5b^8)(0,16a^{12}+0,25b^{16}-0,2a^6b^8)=\) [ ].