Question

Pessoal do Enem por favor podem me ajudar?

Answer 1

a) 2-x > 9
-x > 9-2
-x > 7 (-1)
x < 7.

b) 3 < 7x +1
-7x < 1 - 3
-7x < -2 (-1)
7x > 2
x > 2/7
x > 0,28.

c) 3x-4 < x + 5
3x-x < 5+4
2x < 9
x < 9/2
x < 4,5.

d) x-1/2 > 3/2 + 2x
x-2x > 3/2+1/2
-x > 2 (-1)
x < -2.

e) x+(x+1) > 3(1-x)
x+x+1 > 3-3x
2x+3x > 3-1
5x > 2
x > 2/5
x > 0,4.

f) x-(x+1) < x+2
x-x+1 < x+2
x-x-x < 2-1
-x < 1 (-1)
x > -1.