Posto le mie soluzioni di quasi tutta la pagina di limiti 3.

[b:3sqfrxyg]1[/b:3sqfrxyg]
a&lt;4  lim=0
a=4 lim=5
a&gt;4 lim=+inf


a&gt;4 lim =0
a=4 lim=1
a&lt;4 lim=+inf

a=1 lim=-3
a&gt;1 lim=-inf
a&lt;1 lim=+inf


[b:3sqfrxyg]2[/b:3sqfrxyg]
1/5
1/5
1


[b:3sqfrxyg]3a[/b:3sqfrxyg]
0
+inf
+inf
1


[b:3sqfrxyg]5[/b:3sqfrxyg]
4
4
4
+inf


[b:3sqfrxyg]6[/b:3sqfrxyg]
-1&lt;=a&lt;=1  lim=0
a&gt;1  lim=a
a&lt;1  lim non esiste

-4&lt;a&lt;=4 lim=4
a&lt;=-4 lim non esiste
a&gt;4 lim=a

+inf

-2&lt;=a&lt;=2 lim=2
a&gt;2 lim=4/a
a&lt;-2 lim non esiste


[b:3sqfrxyg]7[/b:3sqfrxyg]
0
0