p(a) = a(10 - a)/(a - 5)
p(10 - a) = (10 - a)(10 - (10 - a))/(10 - a - 5) = (10 -a)a/(5 - a)
вместо a подставляем 10 - a
p(a)/p(10 - a) = a(10 - a)/(a - 5) : (10- a)a/(5 - a) = a(10 - a)/(a - 5) * (5 - a)/ (10- a)a = -1
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p(a) = a(10 - a)/(a - 5)
p(10 - a) = (10 - a)(10 - (10 - a))/(10 - a - 5) = (10 -a)a/(5 - a)
вместо a подставляем 10 - a
p(a)/p(10 - a) = a(10 - a)/(a - 5) : (10- a)a/(5 - a) = a(10 - a)/(a - 5) * (5 - a)/ (10- a)a = -1