dam factor la numarator , numitor 2^x
x
formam necunoscuta t = (5/2 )
ec. devine
( t + m ) = 2 · ( 1 -mt)
t +m = 2 - 2mt
t + 2mt = 2 -m ⇒ t = ( 2 -m) / ( 1 +2m )
↓
= exp. este egala cu numar pozitiv
m - ∞ -1/2 2 +∞
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2 -m + + + 0 - -
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1 +2m - - 0 + + +
poz daca m ∈ ( -1/2 ; 2)
