1/15(t^2-2ty+y^2)=1/15(t-y)^2
(1/15(t-y)^2)/(t-y)=1/15*(t-y)
Ответ :(t-y) и 1/15
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1/15(t^2-2ty+y^2)=1/15(t-y)^2
(1/15(t-y)^2)/(t-y)=1/15*(t-y)
Ответ :(t-y) и 1/15