Ответы и объяснения

2013-09-23T08:55:43+00:00
А) 1) ((a^2-ab)/(b^2-1))*((b+1)/a)=((a*(a-b))/((b-1)*(b+1)))*((b+1)/a)=(a-b)/(b-1)
2) (a/(1-b))+((a-b)/(b-1))=(a/(1-b))-((a-b)/(1-b))=(a-a+b)/(1-b)=b/(1-b)
б) 1) ((m^2-9)/m)/((m-3)^2/m)=(((m-3)*(m+3))/m)*(m/(m-3)^2)=(m+3)/(m-3)
2) ((m+3)/(m-3))+(6/(3-m))=((m+3)/(m-3))-(6/(m-3))=(m+3-6)/(m-3)=(m-3)/(m-3)=1