Question

пожалуйста решите этот пример!!!

Answer 1

$\displaystyle\tt a^4\cdot \bigg(\frac{3a+b}{a}-3 \bigg)^2+b^4\cdot \bigg(\frac{a-2b}{b}+2 \bigg)^2-4(ab)^2=\\\\=a^4\cdot \bigg(\frac{3a+b-3a}{a} \bigg)^2+b^4\cdot \bigg(\frac{a-2b+2b}{b} \bigg)^2-4(ab)^2=\\\\=a^4\cdot \bigg(\frac{b}{a} \bigg)^2+b^4\cdot \bigg(\frac{a}{b} \bigg)^2-4(ab)^2= a^4\cdot \frac{b^2}{a^2}+b^4\cdot \frac{a^2}{b^2}-4(ab)^2=\\\\=a^2b^2+a^2b^2-4a^2b^2=2a^2b^2-4a^2b^2=-2a^2b^2$