Помогите пожалуйста))))) НАЙДИТЕ ЗНАЧЕНИЕ ВЫРАЖЕНИЯ
[tex] \frac{a+b}{15ab} * \frac{30a^2b}{a^2-b^2} - 1 [/tex] при а =2 при в=-2
[tex] \frac{4ab-4b^2}{a^4+a} : \frac{5a-5b}{a^3+1} + 20[/tex] при а =5 при в=-4
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