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Rezolvati ecuatia 1/3^x=81
Va rog !!!❤️


Răspuns :

(1/3)^x=81
(3)^-x =3^4
-x=4 | ×(-1)
x= - 4
1/3^x=81
3^x*81=1
3^x*3^4=1
3^(x+4)=1
3^(x+4)=3^0
x+4=0
x=-4