Ответ:
1. 9(х-1)+5х<7-16
9х-9+5х<7-16
14х-9<7х-16
14х-7х-<16+9
7х<-7
х<-1
2. 7(1-2х)+5х≥4-9х
7-14х+5х≥4-9х
7-9х≥4-9х
7≥4
хЄR
3. 1-х/30-1+х/15≥7/60
2(1-х)-4(1+х)≥7
2-2х-4-4х≥7
-2-6х≥7
-6х≥7+2
-6х≥9
х≤-3/2
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Answers & Comments
Ответ:
1. 9(х-1)+5х<7-16
9х-9+5х<7-16
14х-9<7х-16
14х-7х-<16+9
7х<-7
х<-1
2. 7(1-2х)+5х≥4-9х
7-14х+5х≥4-9х
7-9х≥4-9х
7≥4
хЄR
3. 1-х/30-1+х/15≥7/60
2(1-х)-4(1+х)≥7
2-2х-4-4х≥7
-2-6х≥7
-6х≥7+2
-6х≥9
х≤-3/2