упростите выражение
1) ([tex] \frac{2}{a+1} - \frac{1}{a-1} [/tex]) ÷([tex] \frac{4}{a+1} + \frac{1}{a-4} [/tex]
2) ([tex] \frac{a-1}{a+4} - \frac{a-3}{a-4} [/tex])×[tex] \frac{a+4}{3a-8} + \frac{a}{2a-8}
[/tex] ОЧЕНЬ НАДО
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