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1505123Diana1505123
1505123Diana1505123
26.07.2021 09:57 •  Алгебра

точка движется прямолинейно по закону xt=5t2+3t-12, где xt - перемещение в сантиметрах, t - время в секундах. В какой момент времени скорость точки будет равна 33см/с?

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Ответ:
skymiss
skymiss
02.09.2022 12:11

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Must Waste More Time...

0,0(0 оценок)
Ответ:
Aleksandra19771
Aleksandra19771
01.09.2022 12:33
Решение если условие такое, то 1)   [-  12\ (х  -  1)²]    -  2  ≥ 0 - 12 - 2 * (x - 1)²  ≥ 0, x - 1  ≠ 0, x  ≠ 1 - 12 - 2 * (x² - 2x + 1)  ≥ 0 - 12 - 2x² + 4x - 2  ≥ 0 2x² - 4x + 14  ≤ 0 x² - 2x + 7  ≤ 0d = 4 - 4*1*7 = - 24 < 0решений нет 2)   если условие такое, то -  12\ [(х  -  1)²    -  2]  ≥ 0 - 12 < 0, значит (x - 1)²  - 2 > 0 x² - 2x + 1 - 1 > 0 x² - 2x > 0 x(x - 2) > 0 x = 0 x = 2 x∈(-∞; 0)∪(2; +∞)
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