Объяснение:
(2t-t²)+(4t-5)-(t-5) =2t+4t-t-t²=4t
1. 2t - t^2 + 4t^2 - 5 - t+ 5 = 3t^2 + t
2. -4x^3y - 8x^2y^2 + 4xy^3
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Объяснение:
(2t-t²)+(4t-5)-(t-5) =2t+4t-t-t²=4t
1. 2t - t^2 + 4t^2 - 5 - t+ 5 = 3t^2 + t
2. -4x^3y - 8x^2y^2 + 4xy^3