Jlby dfhbfyn
Объяснение:
1) (8t−9)⋅(8t−9)=(8t−9)^2=64t^2−144t+81 .
(8t-9)*(8t-9)
(8t-9)*(8t+9)=64t2-81
(8t+9)*(8t+9)=64t2+144t+81
(8t+9)2=16t+18
