Помогите пожалуйста с алгеброй
Упростить
1. [tex] \frac{a}{a^2-3a} + \frac{a-8}{a} + \frac{7a^2-3a-72}{a^3-9a} [/tex]
2. [tex]( \frac{1}{a^2} + \frac{1}{b^2} + \frac{2}{a+b} *( \frac{1}{a} + \frac{1}{b} )): ( \frac{a+b}{ab} )^2[/tex]
Доказать тождсетво
3. [tex]( \frac{4a}{a^2-1} + \frac{a-1}{a+1} )* \frac{2a}{a+1} - \frac{a}{a-1} - \frac{a}{a^2-1} = \frac{a^2}{a^2-1} [/tex]
4. [tex]( \frac{m-2}{m+2} - \frac{m+2}{m-2} ): \frac{8m}{m^2-4} + \frac{1-m}{1-3m} = \frac{2m}{1-3m} [/tex]
Уравнения
5. [tex](x+4)^2+x^2=2x-1[/tex]
6. [tex]x(x^2-2x)=x^3-8[/tex]
7. (x+5)(x-4)+x^2+18=0
8. (x+7)(x-7)+(x-3)^2=53
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