Calculo 1
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Departamento de Matematica
RADAVELLI
Lista: Limites 03
1. Calcule os limites:
A) limx→−∞
2x2 − x − 3
x3 − 2x2 − x + 2
B) lim
x→−2
2x2 − x − 3
x3 − 2x2 − x + 2
C) limx→1
(πx)
x − 1
D) limx→+∞
1 +
2
xx
E) limx→+∞
x
x + 1
x
F) limx→0
5x − 2x
x
G) limt→0
ln (t + 1)
t
2. Para a funcao f (x) =
(x), calcule o limite
limh→0
f (a + h) − f (a)
h
.
3. Analise os limites laterais
limx→2+
x2 + x − 6
|x − 2| e lim
x→2−
x2 + x − 6
|x − 2| .
O limite limx→2x2+x−6|x−2|
existe? Explique.
4. Seja f : A ⊂ R → R definida por f (x) = |2x − 1| − |x + 1|. Descreva o
conjunto A.
5. Quando podemos trocar a ordem entre o limite e uma funcao, isto e, quando
vale:
limx→a uf (x) = u lim
x→af (x) ?
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6. Considere as funcoes reais
f (x) = x2 e g(x) =
−4, se x ≤ 0
|x − 4|, se x > 0
Analise se as funcoes compostas (f ◦ g) e (g ◦ f ) sao contınuas em 0.
7. Discuta as continuidades/descontinuidades da funcao
f (x) =
cx2 − 3, se x ≤ 2
cx + 2, se x > 2