Ответы на вопрос:
A/a(a-3)+(a-8)/a+(7a²-3a-72)*[a(a-3)(a+3)]=[a(a+3)+(a-8)(a²-9)/[a(a-3)(a+3)]= =[a(a+3)+(a-8)(a-3)(a+3)+7a²-3a-72]/[a(a-3)(a+3)]= =(a²+3a+a³-9a-8a²+72+7a²-3a-72))/[a(a-3)(a+3)]=(a³-9a)/[a(a-3)(a+3)= =a(a²-9)/[a(a²-9)]=1
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