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Vaaaa Roggggggggggg class=

Răspuns :

Răspuns:

notam lgx=t

t²-4t-5=0

ecuatie de gradul 2: delta=16+20=36

t1=4+6/2=5

t2=4-6/2=1

daca t=5

lgx=5 deci x=10⁵

daca t=1

lgx=1 deci x=10