6−(9−2x)+8≥70−20x
6-9+2х+8-70+20х≥0
22х≥65
Х≥2,9
- +
------------------->
2,9
Ответ:[2,9;+бесконечность)
А⁻⁵:а⁻⁵=1
..................................
2.7*(1.7³-1.5³)/(1.5²+5.1*4.5+4.5²)=2.7(1.7-1.5)(1.7²+1.7*1.5+1.5²)/(1.5²+5.1*4.5+4.5²)=2.7*0.2*(2.89+2.55+2.25)/(2.25+22.95+20.25)=
=4.1526/27.45=0.1513
2х (6х+2)=0
2х=0. 6х+2=0
х1=0. 6х=-2
х2=-1/3