Выполните действия: а) (x+7)/2-(x-13)/2 (1 балл) б) 4/x+(x-2)/(x+5) (2 балла) в) (5a-5b)/(15a^2 )∙a^3/(a^2-b^2 ) ( 2 балла) г) (m^2-4)/n:(m^2-4m+4)/(6n^2 ) (3 балла)
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