(a²-25b²+10bc-c²)/(a²-5ab+5bc-c²)=(a²-(5b-c)²)/(a²-5ab+6,25b²-6,25b²+5bc-c²)=
=(a-5b+c)(a+5b-c)/((a-2,5b)²-(2,5b-c)²)=
=(a-5b+c)(a+5b-c)/(a-2,5b-2,5b+c)(a-2,5b+2,5b-c)=
=(a-5b+c)(a+5b-c)/(a-5b+c)(a-c)=(a+5b-c)/(a-c)
ответ:(a+5b-c)/(a-c)
(a²-25b²+10bc-c²)/(a²-5ab+5bc-c²)=(a²-(5b-c)²)/(a²-5ab+6,25b²-6,25b²+5bc-c²)=
=(a-5b+c)(a+5b-c)/((a-2,5b)²-(2,5b-c)²)=
=(a-5b+c)(a+5b-c)/(a-2,5b-2,5b+c)(a-2,5b+2,5b-c)=
=(a-5b+c)(a+5b-c)/(a-5b+c)(a-c)=(a+5b-c)/(a-c)
ответ:(a+5b-c)/(a-c)