Question

(t−m)(t+m)+(9k−t)(9k+t)+(m−9k)(m+9k)=0

Answer 1

Объяснение:

$(t-m)(t+m)+(9k-t)(9k+t)+(m-9k)(m+9k)=0\\t^2-m^2+81k^2-t^2+m^2-81k^2=0\\0=0.$