![f'(x)=(ln(x+3)^{13}-13x)'=(13ln(x+3)-13x)'=13(ln(x+3)-x)'=\\ =13((x+3)'\frac{1}{x+3} -1)=13(\frac{1}{x+3} -1)=13*\frac{1-x-3}{x+3} =13*\frac{-(x+2)}{x+3} \\](https://tex.z-dn.net/?f=+f%27%28x%29%3D%28ln%28x%2B3%29%5E%7B13%7D-13x%29%27%3D%2813ln%28x%2B3%29-13x%29%27%3D13%28ln%28x%2B3%29-x%29%27%3D%5C%5C+%3D13%28%28x%2B3%29%27%5Cfrac%7B1%7D%7Bx%2B3%7D+-1%29%3D13%28%5Cfrac%7B1%7D%7Bx%2B3%7D+-1%29%3D13%2A%5Cfrac%7B1-x-3%7D%7Bx%2B3%7D+%3D13%2A%5Cfrac%7B-%28x%2B2%29%7D%7Bx%2B3%7D+%5C%5C+)
f'(x) ------ -3 ++++++++ -2 ------------
-------------о----------------о---------------
Значит максимум достигается при x=-2
f(-2)=0-13*(-2)=26
Ответ: 26
1)1500*0.16=240(руб)
2)240+1500=1740(руб)
Ответ:1740рублей.
<span>-(3,6 - у)+(-у-2,6)
-3,6+у-у-2,6
Итог:
-6,2</span>
Здравствуйте)
252х÷3-245=343
252÷3х-245=343
84х-245=343
84х=343+245
84х=588
х=588÷84
х=7
А) -27x +5x = -220
-22x = -220
x = 10
б) 7a - 3a = -310
4a = -310
a = -77,5
в) -2x - 5x = -19 - 16
-7x = -35
x = 5
г) -3b +5b = 9 - 25
2b = -16
b = -8
д) 11y - y = 203 - 3
10y = 200
y = 20