............Система неравенств решений не имеет......................................................................................................................................
1.8 a) y=![\sqrt{x} -1](https://tex.z-dn.net/?f=%5Csqrt%7Bx%7D%20-1)
x-1 ≥ 0
x≥1
(3,8+7,15)*0,11= 10.95 * 0.11 = 1.2045
13,2:1,2-4,7= 11 - 4.7 = 6.3
Разберем каждую часть отдельно:
![\frac{1}{4}+ (\frac{1}{4})^-^1= \frac{1}{4}+4=4 \frac{1}{4}= \frac{17}{4}](https://tex.z-dn.net/?f=+%5Cfrac%7B1%7D%7B4%7D%2B+%28%5Cfrac%7B1%7D%7B4%7D%29%5E-%5E1%3D+%5Cfrac%7B1%7D%7B4%7D%2B4%3D4+%5Cfrac%7B1%7D%7B4%7D%3D+%5Cfrac%7B17%7D%7B4%7D)
![25^-^0^,^5=25^-^ \frac{1}{2}= \frac{1}{ \sqrt{25}}= \frac{1}{5}](https://tex.z-dn.net/?f=25%5E-%5E0%5E%2C%5E5%3D25%5E-%5E+%5Cfrac%7B1%7D%7B2%7D%3D+%5Cfrac%7B1%7D%7B+%5Csqrt%7B25%7D%7D%3D+%5Cfrac%7B1%7D%7B5%7D)
Сейчас умножим эти числа, получится:
![\frac{17}{4}*\frac{1}{5}= \frac{17}{20}= \frac{85}{100}=0,85](https://tex.z-dn.net/?f=+%5Cfrac%7B17%7D%7B4%7D%2A%5Cfrac%7B1%7D%7B5%7D%3D+%5Cfrac%7B17%7D%7B20%7D%3D+%5Cfrac%7B85%7D%7B100%7D%3D0%2C85)
1. (x-1)(x+1)(2x+1)
2. (b^2-4a)(2a-b)