Упростить
[tex] \frac{(ab^{-1}+a^{-1}b+1)(a^{-1}-b^{-1})^2}{a^2b^{-2}+a^{-2}b^2-(ab^{-1}+a^{-1}b)} [/tex]
и найти его значение, если a=4, b=5
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