Ответ:
1) 7а - 1/5а
2) 3 - 2(х+1)/х^2-1 = 1-2х/х^2-1
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Ответ:
1) 7а - 1/5а
2) 3 - 2(х+1)/х^2-1 = 1-2х/х^2-1