![\frac{4x+3y}{4x-3y}=\frac{4*(-\frac{3}{4})+3*(-\frac{1}{6})}{4*(-\frac{3}{4})-3*(-\frac{1}{6})}=\frac{-3-\frac{1}{2} }{-3+\frac{1}{2} }=\frac{-3,5}{-2,5}=1,4](https://tex.z-dn.net/?f=%5Cfrac%7B4x%2B3y%7D%7B4x-3y%7D%3D%5Cfrac%7B4%2A%28-%5Cfrac%7B3%7D%7B4%7D%29%2B3%2A%28-%5Cfrac%7B1%7D%7B6%7D%29%7D%7B4%2A%28-%5Cfrac%7B3%7D%7B4%7D%29-3%2A%28-%5Cfrac%7B1%7D%7B6%7D%29%7D%3D%5Cfrac%7B-3-%5Cfrac%7B1%7D%7B2%7D+%7D%7B-3%2B%5Cfrac%7B1%7D%7B2%7D+%7D%3D%5Cfrac%7B-3%2C5%7D%7B-2%2C5%7D%3D1%2C4)
2a)
- 2(2b - 3) + 4(3b - 2) = - 4b + 6 + 12b - 8 = 8b - 2
б)
15a - (a + 3) + (2a - 1)= 15a - a - 3 + 2a - 1 = 16a - 4
в)
5a - (6a - (7a - (8a - 9))) = 5a - (6a - (7a - 8a + 9)) = 5a - (6a + a - 9) = 5a - (7a - 9)=
= 5a - 7a + 9 = 9 - 2a
3)
- 2(3,5y - 2,5) + 4,5y - 1 = - 7y + 5 + 4,5y - 1 = - 2,5y + 4
- 2,5 * 4/5 + 4 = - 2 + 4 = 2