Ответ:
Объяснение:
(b²-18b-c²+81)/(b²+2bc+c²-9b-9c)=
=(b²-18b+81-c² ) / [(b²+2bc+c²)-9(b+c)]=
=[(b-9)²-c²] / [(b+c)²-9(b+c)]=
=(b-9-c)(b-9+c) / (b+c)(b+c-9)=(b-9-c)/(b+c)
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Ответ:
Объяснение:
(b²-18b-c²+81)/(b²+2bc+c²-9b-9c)=
=(b²-18b+81-c² ) / [(b²+2bc+c²)-9(b+c)]=
=[(b-9)²-c²] / [(b+c)²-9(b+c)]=
=(b-9-c)(b-9+c) / (b+c)(b+c-9)=(b-9-c)/(b+c)