Автор - girlokay

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Ответ

Автор - maylytail

 frac{t ^{2}  + 10t}{10}  -  frac{2t + 5}{2}  = 20 \  \  frac{t^{2}  + 10t - (5(2t + 5))}{10}  = 20 \  \ t^{2}  + 10t - 10t - 25 = 200 \  \ t^{2}  = 225 \  \ t1 = 15 \  \ t2 =  - 15

Ответ: при t = 15; -15.

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