Решите двойное неравенство пожалуйста!
1) -2 < 3х+1< 7
2) 2 < 5х-3< 17
3) 3< 7-4х< 15
4) -12< 2(х+3) < 4
1) -2 < 3х+1< 7
2) 2 < 5х-3< 17
3) 3< 7-4х< 15
4) -12< 2(х+3) < 4
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Answers & Comments
-2 < 3х+1< 7
-3< 3х< 6
-1<х <2
2)
2 < 5х-3< 17
5<5х < 20
1< х< 4
3)
3< 7-4х< 15
-4<-4х < 8
-2<х < 1
4)
-12< 2(х+3) < 4
-6<х+3 < 2
-9<х < -1