domingo, 7 de septiembre de 2008

Ejercicio de intervalos (clase)

Resolver las siguientes desigualdades, expresar la solucion como intervalo.

1-. 3-2/3 x ≤ 1

-2/3 x ≤ 1-3
(-1)-2/3 x ≤-2(-1)
x ≥ 3
[3,∞)

2-. 2x-1 ≤ 2x+4
-1 ≤ 4

[-1,4]

3-. 1/3 x + 1/2 < 2/3 - 5/2 x

1/3 x + 5/2 x < 2/3 - 1/2
17/6 x < 1/6
x < 1/17

(-∞ , 1/17)

4-. 1/2 x < -5x + 2/3

1/2 x +5x < 2/3
11/2 x < 2/3
x < 44/33

(-∞,4/33)

5-. 3 > 6 -3/5 x ≥ 1

-6+3 >-3/5 x ≥ 1-6
-3 >-3/5 x ≥ -5
(-1)-3>-3/5 x ≥ -5 (-1)
3 < 3/5 x ≤ 5
5 < x ≤ 25/3

(5,25/3]

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