Ответ:
s^2-r^2-26s+169 = (s^2-26s+169)-r^2 = (s-13)^2-r^2 = (s-13-r)(s-13+r)
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Ответ:
s^2-r^2-26s+169 = (s^2-26s+169)-r^2 = (s-13)^2-r^2 = (s-13-r)(s-13+r)