1)Нет
2)Нет
3)Нет
4)Нет
5)Нет
6)Нет
12x(x-8)-4x(3x-5)=10-26x
12x^2-96x-12x^2+20x=10-26x
12x^2-96x-12x^2+20x -10+26x=0
12x^2 и -12x^2 сократились
-10-50x=0
-50x=10 делим на -50
x=-0,5
Ответ:-0,5
<span>(2х-1)(15+9х)-6х(3х-5)=87
30x+18x^2-15-9x-18x^2+30x=87
</span>30x-15-9x+30x=87
51x=102
x=2
<span>0.9b-0.5=9.4
</span>0.9b=9.4+0.5
0.9b=9.9
b=9.9/0.9
b=11
ответ:11
;)
![L(x)=f(a)+f'(a)(x-a)](https://tex.z-dn.net/?f=L%28x%29%3Df%28a%29%2Bf%27%28a%29%28x-a%29)
- уравнение касательной к функции
![f(x)](https://tex.z-dn.net/?f=f%28x%29)
в точке
![x=a](https://tex.z-dn.net/?f=x%3Da)
1)
![f'(x)=[x^6+4x^3-1]'=6x^5+12x^2\\\\ f'(-1)=-6+12=6\\\\ f(-1)=1-4-1=-4\\\\ L(x)=-4+6*(x-(-1))=-4+6(x+1) =-4+6x+6=\\\\=L(x)=6x+2](https://tex.z-dn.net/?f=f%27%28x%29%3D%5Bx%5E6%2B4x%5E3-1%5D%27%3D6x%5E5%2B12x%5E2%5C%5C%5C%5C+f%27%28-1%29%3D-6%2B12%3D6%5C%5C%5C%5C+f%28-1%29%3D1-4-1%3D-4%5C%5C%5C%5C+L%28x%29%3D-4%2B6%2A%28x-%28-1%29%29%3D-4%2B6%28x%2B1%29+%3D-4%2B6x%2B6%3D%5C%5C%5C%5C%3DL%28x%29%3D6x%2B2)
3)
![f(x)=\sqrt{5-4x}\\\\ f'(x)=\frac{(5-4x)'}{2\sqrt{5-4x}}=\frac{-4}{2\sqrt{5-4x}}=-\frac{2}{\sqrt{5-4x}}\\\\ f(1)=\sqrt{5-4}=1\\\\ f'(1)=-\frac{2}{1}=-2\\\\ L(x)=1+(-2)*(x-1)=1-2x+2=-2x+3\\\\ tg(\alpha)=-2\ \textless \ 0](https://tex.z-dn.net/?f=f%28x%29%3D%5Csqrt%7B5-4x%7D%5C%5C%5C%5C+f%27%28x%29%3D%5Cfrac%7B%285-4x%29%27%7D%7B2%5Csqrt%7B5-4x%7D%7D%3D%5Cfrac%7B-4%7D%7B2%5Csqrt%7B5-4x%7D%7D%3D-%5Cfrac%7B2%7D%7B%5Csqrt%7B5-4x%7D%7D%5C%5C%5C%5C+f%281%29%3D%5Csqrt%7B5-4%7D%3D1%5C%5C%5C%5C+f%27%281%29%3D-%5Cfrac%7B2%7D%7B1%7D%3D-2%5C%5C%5C%5C+L%28x%29%3D1%2B%28-2%29%2A%28x-1%29%3D1-2x%2B2%3D-2x%2B3%5C%5C%5C%5C+tg%28%5Calpha%29%3D-2%5C+%5Ctextless+%5C+0)
2) - скриншотами своего же решения ранее
тупой угол