va rog ajutor ex 19 plsssss

a =2^2008-2^2007-2^2006
a=2^2006(2²-2¹-1)
a = 2^2006 * 1
a = 2 ^ 2006
adica a il putem scrie ca:
a=(2²)^1003=4^1003
c=3:0,25 = 12
b=4^1004
==>
a/b=c/x
==>
4^1003/4^1004=12/x
==> 1/4=12/x
==>x*1=12*4
==>x=48
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