Б) 15-6(3х-1)>0,5(4х-2)
1/3(2х+1)<х
2х+1/7-3х-1/14>0 /*14
15-18х+6>2х-1
2/3х+1/3<х /*3
4х+2-3х+1>0
-20х>-22
2х+1<3х
х>-3
х<22/20
-х<-1
х>-3
х>11/10
х>1
х>-3
Ответ: (-3;+беск)
An=a1+d(n-1)
0,5=3,5+6d
-3=6d
D=(-0,5)
2х-10=4х+2
2х-4х=10+2
-2х=12
х=-6
8x*2 - 6x + 12x - 9 - 17 = 8x*2 + 2x
8x*2 - 8x*2 + 12x - 2x - 6x = - 9 - 17
4x = - 26
x = -28 : 4
x = -6