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Упрости выражения.

1. \(\frac{4a^2-24a+36}{a^3+1}\cdot \frac{7a^2-7a+7}{8a-24}=\)
   [ \(\frac {7(a-3)}{2(a+1)}\) | \(\frac {a-3}{a+1}\) | \(\frac {7(a^2-a+1)}{a+1}\) ]
2. \(\frac{x^2-9y^2}{16x^2-9y^2}\colon \frac{x^2+6xy+9y^2}{16x^2-24xy+9y^2}=\)
   [ \(\frac {4x^2-15xy+9y^2}{4x^2+15xy+9y^2}\) | \(-1\) | \(1\) ]
3. \(\frac{(x^n+2y^n)^2-8x^ny^n}{x-y}\colon \frac{x^{2n}-4y^{2n}}{x^2-y^2}=\)
   [ \(\frac {(x^n-2y^n)(x+y)}{x^n+2y^n}\) | \(x+y\) | \(\frac {1}{x^n+2y^n}\) ]