Question

sendo U =Q, resolva as inequações A (x+2)+(x+3)+(x4)<1.

B 4-2x >3-3x

C x-5<1-x

Answer 1

a)
(x+2)+(x+3)+(x4)<1. 
x+2+x+3+4x<1
6x+5<1
6x<1-5
6x<-4
6x/6<-4/6
x<-2/3
S={x∈Q/x<-2/3} o Q representa o conjunto dos racionais. Lembra do traço

b)
4-2x >3-3x
-2x>-4+3-3x
-2x+3x>-1
x>-1
S={x∈Q/x>-1}

c)
x-5<1-x
x<5+1-x
x+x<6
2x<6
2x/2<6/2
x<3
S={X∈Q/x<3}