2) у= -(1/3)x -6
7= -(1/3)x -6
13= -(1/3)x
x=13: (-1/3)
х=-39
3) у=-(1/3)*(-42) -6 =14-6=8 ,да т.С(-42 ;8) принадлежит графику
4) у=-(1/3)*0 -6 =-6 (0 ;-6) с осью ординат
0= -(1/3)x -6 6=-(1/3)x х= -18 (-18 ;0) с осью абсцисс
237х=56782-139
237х=56643
х=56643:237
х=239.
![sin^{2}60-tg(-45)+sin180=(\frac{\sqrt{3}}{2})^{2}-(-1)+0=\frac{3}{4} +1=1,75](https://tex.z-dn.net/?f=sin%5E%7B2%7D60-tg%28-45%29%2Bsin180%3D%28%5Cfrac%7B%5Csqrt%7B3%7D%7D%7B2%7D%29%5E%7B2%7D-%28-1%29%2B0%3D%5Cfrac%7B3%7D%7B4%7D%20%2B1%3D1%2C75%20)
![\frac{x^{2}+5x-6}{-x^{2}+2x-1}=1](https://tex.z-dn.net/?f=%5Cfrac%7Bx%5E%7B2%7D%2B5x-6%7D%7B-x%5E%7B2%7D%2B2x-1%7D%3D1%20)
ОДЗ:
![-x^{2}+2x-1\neq 0](https://tex.z-dn.net/?f=-x%5E%7B2%7D%2B2x-1%5Cneq%200%20)
![x^{2}-2x+1\neq 0](https://tex.z-dn.net/?f=x%5E%7B2%7D-2x%2B1%5Cneq%200)
![(x-1)^{2}\neq 0](https://tex.z-dn.net/?f=%28x-1%29%5E%7B2%7D%5Cneq%200)
![x-1\neq 0](https://tex.z-dn.net/?f=x-1%5Cneq%200)
![x\neq 0](https://tex.z-dn.net/?f=x%5Cneq%200)
![x^{2}+5x-6=-x^{2}+2x-1](https://tex.z-dn.net/?f=x%5E%7B2%7D%2B5x-6%3D-x%5E%7B2%7D%2B2x-1)
![x^{2}+5x-6+x^{2}-2x+1=0](https://tex.z-dn.net/?f=x%5E%7B2%7D%2B5x-6%2Bx%5E%7B2%7D-2x%2B1%3D0)
![2x^{2}+3x-5=0](https://tex.z-dn.net/?f=2x%5E%7B2%7D%2B3x-5%3D0)
D=![D=3^{2}-4*2*(-5)=49](https://tex.z-dn.net/?f=D%3D3%5E%7B2%7D-4%2A2%2A%28-5%29%3D49)
![x_{1}=(-3+7)/4=1, x_{2}=(-3-7)/4=-2,5](https://tex.z-dn.net/?f=x_%7B1%7D%3D%28-3%2B7%29%2F4%3D1%2C%20x_%7B2%7D%3D%28-3-7%29%2F4%3D-2%2C5)
Т.к. х не может равняться 1, то ответом является число -2,5