límits i continuïtat de funcions - matessantboianes
límits i continuïtat de funcions - matessantboianes
límits i continuïtat de funcions - matessantboianes
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059 calcula lim<br />
x → + `<br />
⎛<br />
⎜ x + 5 ⎞<br />
⎜<br />
⎟<br />
⎝⎜<br />
⎟<br />
x −1<br />
⎠⎟<br />
(Activitat <strong>de</strong> Selectivitat)<br />
lim<br />
x→<br />
+ `<br />
lim<br />
x→<br />
+ `<br />
⎛<br />
⎜ x + 5 ⎞<br />
⎜<br />
⎝⎜<br />
x − 1 ⎠⎟<br />
⎛ x + 5 ⎞<br />
⎜<br />
⎝⎜<br />
x − 1 ⎠⎟<br />
060 calcula el límit: lim<br />
2 x<br />
x+<br />
3<br />
x → + `<br />
2 x<br />
x+<br />
3<br />
(Activitat <strong>de</strong> Selectivitat)<br />
x→<br />
+ `<br />
lim<br />
x→<br />
+ `<br />
061 calcula: lim<br />
⎛ 3x+ 1⎞<br />
⎜<br />
⎝⎜<br />
3 x − ⎠⎟<br />
=<br />
x<br />
1<br />
2 x<br />
x+<br />
3<br />
.<br />
→ 1<br />
=<br />
⎛<br />
x<br />
x<br />
lim ⎜ 3 + 1⎞<br />
⎜ → 1<br />
⎝⎜<br />
3x−1 ⎠⎟<br />
x → + `<br />
⎛ x<br />
⎜ 2 − 8 ⎞<br />
⎜<br />
⎟<br />
⎝⎜<br />
⎠⎟<br />
x+<br />
2 1<br />
(Activitat <strong>de</strong> Selectivitat)<br />
`<br />
+<br />
− −<br />
⎛ 5 ⎞<br />
+ ⎝⎜<br />
1 1<br />
x<br />
x<br />
e x<br />
lim<br />
→ ` ⎠⎟<br />
⋅ ⎡<br />
2<br />
⎢<br />
x ⎤<br />
⎥<br />
⎢<br />
⎥<br />
⎣⎢<br />
x+<br />
3 ⎦⎥<br />
2 6 x<br />
lim<br />
x→<br />
+ ` 2 x + 2 x−3<br />
6<br />
= e = e<br />
⎛<br />
⎜ 3x+ 1 ⎞<br />
⎜<br />
⎟<br />
⎝⎜<br />
⎟<br />
3x−1 ⎠⎟<br />
`<br />
x<br />
=<br />
x+−+ x ⋅x<br />
+ e x<br />
2<br />
( 5 1)<br />
lim<br />
→ ` ( x− 1)( x+<br />
3)<br />
+<br />
+ − −<br />
⎛ 3 1 ⎞⎟<br />
⎝⎜<br />
3 1 ⎠<br />
1<br />
x<br />
x<br />
e x<br />
lim<br />
→ `<br />
⎟ ⋅<br />
⎡<br />
⎤<br />
⎢<br />
x ⎥<br />
( 3 x+− 1 3 x+ 1)<br />
⋅x<br />
⎥ lim<br />
⎣<br />
⎦<br />
x→<br />
+ = ` 3 x−1<br />
=<br />
⎛ x<br />
x<br />
lim<br />
⎜ 2 − 8 ⎞ ⎛<br />
⎜ = lim<br />
⎜ 2 2<br />
⎜ −<br />
→+ ` x+ x→+<br />
x+<br />
⎝⎜<br />
1 2 ⎠⎟<br />
` 1 ⎝⎜<br />
2 2<br />
x<br />
3<br />
e e<br />
⎞ ⎛ 1 2<br />
= lim<br />
⎜ −<br />
⎠⎟<br />
→ `⎝⎜<br />
2 2<br />
x+ 1 x +<br />
x<br />
2<br />
Solucionari<br />
=<br />
2 x 2<br />
lim<br />
x→<br />
+ ` 3 x− 1 = e 3<br />
⎞ 1<br />
=<br />
⎠⎟<br />
2<br />
062 Expressa les <strong>funcions</strong> següents com a <strong>funcions</strong> <strong>de</strong>fini<strong>de</strong>s a trossos i, <strong>de</strong>sprés,<br />
troba’n els <strong>límits</strong> quan x ten<strong>de</strong>ix a −` i a +`.<br />
a) f( x)= x + 2 − x−2<br />
b) f( x)= x− 3−2x c) f( x)=<br />
2x+ 3<br />
x − 2<br />
x<br />
d) f( x)=<br />
x<br />
− 3<br />
1−<br />
7<br />
⎧⎪<br />
−x −2−− ( x + 2) si x