6) -2< x ≤ 8
-10 < 5x ≤ 40
-2 < 5x + 8 ≤ 48
-1 < (5x + 8)/2 ≤ 24
Pertenece al intervalo ]-1; 24]
7) 10 ≤ x ≤ 15
30 ≤ 3x ≤ 45
25 ≤ 3x - 5 ≤ 40
1/40 ≤ 1/(3x - 5) ≤ 1/25
1/8 ≤ 5/(3x - 5) ≤ 1/5
Pertenece al intervalo [1/8; 1/5]
8) -4 < x ≤ 3
-8 < 2x ≤ 6
-3 < 2x + 5 ≤ 11
--> Piden suma de valores:
S=11(12)/2 -2-1
S= 66 - 3
S = 63
