-
Вопрос по другим предметам:
Найдите наименьшее значение функции на [8;18]-
Автор:
nayeli
-
-
Найдем наименьшее значение функции y = (x - 10)^2 + (x + 10) - 7 на отрезке [8; 18].
1) y \' = ((x - 10)^2 + (x + 10) - 7) \' = 2 * (x - 10) * (x - 10) \' + (x - 10) \' - 7 \' = 2 * (x - 10) + x \' + 0 = 2 * (x - 10) + 1 = 2 * x - 2 * 10 + 1 = 2 * x - 20 + 1 = 2 * x - 19;
2) 2 * x - 19 = 0;
2 * x = 19;
x = 19/2;
x = 9.5;
3) y (8) = (x - 10)^2 + (x + 10) - 7 = (-2)^2 + 18 - 7 = 4 + 11 = 15;
y (18) = (x - 10)^2 + (x + 10) - 7 = 64 + 28 - 7 = 64 + 21 = 85;
y (9.5) = (x - 10)^2 + (x + 10) - 7 = 0.25 + 19.5 - 7 = 0.25 + 12.5 = 12.75;
Ответ: y min = 12.75.
-
Вопрос по английскому языку:
Помогите с пересказом текста.
It was Friday evening and shopkeepers in Grimsby came to the Midland Bank to put their money into the night safe . But later that evening the night safe disappeared and with it $ 4,000 . Every Friday evening the shopkeepers put the money they take during the week into the night safe . They don't want leave it in their shops , but the bank closes early . The night safe is outside on the wall and the money they put into it goes into the bank . But on this Friday evening the people who came along the street with their bags full of money dropped them not into a night safe , but into a box that belonged to Mr. Mi chael Bell . Mr. Bell , who makes radios and televisions , had the idea when he saw two men outside the bank one evening . When he came home from work , the two men , who were apparently shopkeepers , were putting some money into the night safe . He made the box at home and painted it . When it was ready , he took it to the bank and hung it on the wall next to the night safe . On the front of the night safe he painted the words : " Please use the new night safe . This one is out of order . " Then he went round the corner and waited for the shopkeepers to arrive . He listened while they dropped their bags money into the box . When it was full , he quickly took it down and went hom with $ 4,000 . Mr. Bell is very clever and his idea was good , but not perfec Now he has time to think of other ideas . He's in prison for stealing .
-
Ответов: 1
-
3 года назад
-
-
Вопрос по английскому языку:
Помогите с пересказом текста.
It was Friday evening and shopkeepers in Grimsby came to the Midland Bank to put their money into the night safe . But later that evening the night safe disappeared and with it $ 4,000 . Every Friday evening the shopkeepers put the money they take during the week into the night safe . They don't want leave it in their shops , but the bank closes early . The night safe is outside on the wall and the money they put into it goes into the bank . But on this Friday evening the people who came along the street with their bags full of money dropped them not into a night safe , but into a box that belonged to Mr. Mi chael Bell . Mr. Bell , who makes radios and televisions , had the idea when he saw two men outside the bank one evening . When he came home from work , the two men , who were apparently shopkeepers , were putting some money into the night safe . He made the box at home and painted it . When it was ready , he took it to the bank and hung it on the wall next to the night safe . On the front of the night safe he painted the words : " Please use the new night safe . This one is out of order . " Then he went round the corner and waited for the shopkeepers to arrive . He listened while they dropped their bags money into the box . When it was full , he quickly took it down and went hom with $ 4,000 . Mr. Bell is very clever and his idea was good , but not perfec Now he has time to think of other ideas . He's in prison for stealing .
-
Ответов: 1
-
3 года назад
-
-
Вопрос по другим предметам:
В музей на выставку привезли 205 картин. После того,как часть картин развешали по залам,осталось 97 картин. Сколько залов-
Ответов: 1
-
3 года назад
-
-
Вопрос по другим предметам:
написать уравнение касательной к кривой y=lnx в точке пересечения ее с осью Ox-
Ответов: 1
-
3 года назад
-