Descompuneti in factori: a) x^2-y^2
b)x^2-9
c)4-a^2
d)9y^2-16z^2
e) 25x^2-9y^2
f) a^2b^2-49
g) x^4-a^2
h)9x^4-25
i)1/4-a^2
j)y^2-16/25z^2
k)x^2/9-9y^2/49

l)1/81a^2b^2-4c^2
Descompuneti in factori: a) (x+2)^2-4=[(x+2)-2][(x+2)+2]=x(x+4)
b) (2x+1)^2-9
c) (3a+5)^2-a^2
d) (2x+3y)^2-(x+y)^2
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